kernel January 2013

kernel@lists.fedoraproject.org

12 participants
14 discussions

fedora 14 kernel performance with ip forwarding workload
by Jesse Brandeburg 04 Jun '15

04 Jun '15

The other day I was running the stock fedora kernel on my ip forwarding setup, to see what the performance was, and the performance wasn't very good. system is S5520HC dual socket 2.93GHz Xeon 5570 (Nehalem) with 3 quad port 82580 adapters (12 ports). Traffic is bidirectional 64 byte packets being forwarded and received on each port, basically port to port routing. I am only using 12 flows currently. The driver is igb, and I am using an affinity script that lines up each pair of ports that are forwarding traffic into optimal configurations for cache locality. I am also disabling remote_node_defrag_ratio to stop cross node traffic. With the fedora default kernel from F14 it appears that CONFIG_NETFILTER=y means that I cannot unload all of netfilter even if I stop iptables service. perf showed netfilter being prominent, and removing it gives me much higher throughput. Is there a reason CONFIG_NETFILTER=y ? Isn't it a good thing to be able to disable netfilter if you want to? Jesse

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Issue with 3.8.0-0.rc5.git2.1.fc19 and rv280 based video card
by Bruno Wolff III 06 Feb '13

06 Feb '13

I tried 3.8.0-0.rc5.git2.1.fc19 on three systems. One without X, one using an rv530 based video card and one using an rv280 based video card. The system using the rv280 based card has either extremely slow graphics or busted graphics. The other two seem to function normally. On the rv280 based system it takes longer than normal to sort of get the gdm screen up. It comes up without the background graphic and when I click on the user it doesn't seem to return a password prompt in a reasonable time. C-A-F2 still works and I can use a vt normally. In one case when I switched back I saw the background image. So it may be that video is just running really slow. Things work OK with 3.8.0-0.rc5.git1.1.fc19. When there is a nodebug version of that kernel out, I'll try it to see if it is the ATOMIC_SLEEP debugging or some other change in the kernel causing the problem.

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[PATCH] Drop the old Adaptec AIC7xxx driver
by Paul Bolle 04 Feb '13

04 Feb '13

Ever since v2.4.3 this driver is advertised as not being under active development. It's main advantage to most users will be the warnings it generates at build time: drivers/scsi/aic7xxx_old.c: In function ‘aic7xxx_register’: drivers/scsi/aic7xxx_old.c:7901:5: warning: case value ‘257’ not in enumerated type ‘ahc_chip’ [-Wswitch] drivers/scsi/aic7xxx_old.c:7898:5: warning: case value ‘513’ not in enumerated type ‘ahc_chip’ [-Wswitch] drivers/scsi/aic7xxx_old.c: In function ‘aic7xxx_load_seeprom’: drivers/scsi/aic7xxx_old.c:8517:5: warning: case value ‘257’ not in enumerated type ‘ahc_chip’ [-Wswitch] drivers/scsi/aic7xxx_old.c:8510:5: warning: case value ‘513’ not in enumerated type ‘ahc_chip’ [-Wswitch] Let's drop this old driver. Signed-off-by: Paul Bolle <pebolle(a)tiscali.nl> --- 0) I'm trying to get my kernel builds (which use the Fedora kernel config) warning free. Upstream declined the brilliant fix to silence these warnings (see https://lkml.org/lkml/2012/9/21/104 ). 1) Plan B is to simply drop this old driver in the Fedora kernel altogether. That should silence these warnings too, shouldn't it? But is dropping this old driver acceptable? 2) This patch is entirely untested. config-generic | 1 - 1 file changed, 1 deletion(-) diff --git a/config-generic b/config-generic index 4a8015f..5cc8f8d 100644 --- a/config-generic +++ b/config-generic @@ -341,7 +341,6 @@ CONFIG_SCSI_3W_9XXX=m CONFIG_SCSI_ACARD=m CONFIG_SCSI_AACRAID=m CONFIG_SCSI_AIC7XXX=m -CONFIG_SCSI_AIC7XXX_OLD=m CONFIG_AIC7XXX_CMDS_PER_DEVICE=4 CONFIG_AIC7XXX_RESET_DELAY_MS=15000 # CONFIG_AIC7XXX_BUILD_FIRMWARE is not set -- 1.7.11.7

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Debug slowness test results
by Adam Williamson 01 Feb '13

01 Feb '13

Hey, folks. I've discussed this with jwb on IRC, but mailing it too to make sure the results don't get lost. I tested all the recent kernel builds on my nouveau (9600 GT) desktop and a selection on my Intel laptop, using gtkperf and x11perf (x11perf at ajax's request) as quick and dirty benchmarks, and got the following results. gtkperf tracks very closely with my subjective perception of performance - when the gtkperf numbers jump, those are the kernels that feel very slow to me. I don't really perceive the jumps that are unique to x11perf numbers. It seems pretty clear from these numbers that slub_debug is the biggest offender for me, according to jwb. I didn't put the results in the chart for some reason, but on the nouveau machine just like the intel one, rc5.git1 with slub_debug=- as a kernel parameter gives a fast gtkperf time - in the 2.4-2.5 range - and 'feels' perfectly fine, that's what I'm running right now. nouveau: 3.7.4-204.fc18.x86_64 --------------------- GtkPerf 0.40 - Starting testing: Wed Jan 30 10:19:54 2013 GtkEntry - time: 0.05 GtkComboBox - time: 0.52 GtkComboBoxEntry - time: 0.41 GtkSpinButton - time: 0.11 GtkProgressBar - time: 0.10 GtkToggleButton - time: 0.10 GtkCheckButton - time: 0.04 GtkRadioButton - time: 0.05 GtkTextView - Add text - time: 0.09 GtkTextView - Scroll - time: 0.11 GtkDrawingArea - Lines - time: 0.24 GtkDrawingArea - Circles - time: 0.23 GtkDrawingArea - Text - time: 0.21 GtkDrawingArea - Pixbufs - time: 0.13 --- Total time: 2.38 Sync time adjustment is 0.0455 msecs. 200000000 reps @ 0.0000 msec (30100000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (28200000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (27400000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (24700000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (31400000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (28200000.0/sec): X protocol NoOperation 600000 reps @ 0.0084 msec (119000.0/sec): QueryPointer 600000 reps @ 0.0084 msec (119000.0/sec): QueryPointer 600000 reps @ 0.0083 msec (121000.0/sec): QueryPointer 600000 reps @ 0.0086 msec (116000.0/sec): QueryPointer 600000 reps @ 0.0086 msec (116000.0/sec): QueryPointer 3000000 trep @ 0.0085 msec (118000.0/sec): QueryPointer 3.8.0-0.rc4.git1.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:12:54 2013 GtkEntry - time: 0.03 GtkComboBox - time: 0.60 GtkComboBoxEntry - time: 0.46 GtkSpinButton - time: 0.11 GtkProgressBar - time: 0.09 GtkToggleButton - time: 0.09 GtkCheckButton - time: 0.04 GtkRadioButton - time: 0.05 GtkTextView - Add text - time: 0.09 GtkTextView - Scroll - time: 0.11 GtkDrawingArea - Lines - time: 0.23 GtkDrawingArea - Circles - time: 0.22 GtkDrawingArea - Text - time: 0.20 GtkDrawingArea - Pixbufs - time: 0.13 --- Total time: 2.45 3.8.0-0.rc4.git3.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:15:10 2013 GtkEntry - time: 0.03 GtkComboBox - time: 0.59 GtkComboBoxEntry - time: 0.45 GtkSpinButton - time: 0.12 GtkProgressBar - time: 0.09 GtkToggleButton - time: 0.09 GtkCheckButton - time: 0.04 GtkRadioButton - time: 0.05 GtkTextView - Add text - time: 0.09 GtkTextView - Scroll - time: 0.11 GtkDrawingArea - Lines - time: 0.24 GtkDrawingArea - Circles - time: 0.22 GtkDrawingArea - Text - time: 0.20 GtkDrawingArea - Pixbufs - time: 0.16 --- Total time: 2.47 Sync time adjustment is 0.0187 msecs. 200000000 reps @ 0.0000 msec (32600000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (32300000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (32700000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (32700000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (32700000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (32600000.0/sec): X protocol NoOperation 600000 reps @ 0.0087 msec (115000.0/sec): QueryPointer 600000 reps @ 0.0092 msec (109000.0/sec): QueryPointer 600000 reps @ 0.0089 msec (113000.0/sec): QueryPointer 600000 reps @ 0.0085 msec (118000.0/sec): QueryPointer 600000 reps @ 0.0081 msec (123000.0/sec): QueryPointer 3000000 trep @ 0.0087 msec (115000.0/sec): QueryPointer 3.8.0-0.rc4.git4.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:40:23 2013 GtkEntry - time: 0.03 GtkComboBox - time: 0.58 GtkComboBoxEntry - time: 0.46 GtkSpinButton - time: 0.14 GtkProgressBar - time: 0.11 GtkToggleButton - time: 0.11 GtkCheckButton - time: 0.04 GtkRadioButton - time: 0.05 GtkTextView - Add text - time: 0.09 GtkTextView - Scroll - time: 0.12 GtkDrawingArea - Lines - time: 0.23 GtkDrawingArea - Circles - time: 0.22 GtkDrawingArea - Text - time: 0.20 GtkDrawingArea - Pixbufs - time: 0.15 --- Total time: 2.52 Sync time adjustment is 0.0280 msecs. 200000000 reps @ 0.0000 msec (27100000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (28800000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (30900000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (30500000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (31200000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (29600000.0/sec): X protocol NoOperation 400000 reps @ 0.0141 msec ( 71200.0/sec): QueryPointer 400000 reps @ 0.0140 msec ( 71500.0/sec): QueryPointer 400000 reps @ 0.0140 msec ( 71300.0/sec): QueryPointer 400000 reps @ 0.0142 msec ( 70200.0/sec): QueryPointer 400000 reps @ 0.0136 msec ( 73800.0/sec): QueryPointer 2000000 trep @ 0.0140 msec ( 71600.0/sec): QueryPointer 3.8.0-0.rc4.git5.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:17:20 2013 GtkEntry - time: 0.09 GtkComboBox - time: 1.27 GtkComboBoxEntry - time: 1.11 GtkSpinButton - time: 0.65 GtkProgressBar - time: 0.54 GtkToggleButton - time: 0.59 GtkCheckButton - time: 0.14 GtkRadioButton - time: 0.17 GtkTextView - Add text - time: 0.19 GtkTextView - Scroll - time: 0.63 GtkDrawingArea - Lines - time: 0.48 GtkDrawingArea - Circles - time: 0.36 GtkDrawingArea - Text - time: 0.20 GtkDrawingArea - Pixbufs - time: 0.50 --- Total time: 6.93 Sync time adjustment is 0.1662 msecs. 200000000 reps @ 0.0000 msec (29400000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29700000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29800000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29800000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29100000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (29600000.0/sec): X protocol NoOperation 200000 reps @ 0.0335 msec ( 29900.0/sec): QueryPointer 200000 reps @ 0.0333 msec ( 30000.0/sec): QueryPointer 200000 reps @ 0.0337 msec ( 29600.0/sec): QueryPointer 200000 reps @ 0.0334 msec ( 30000.0/sec): QueryPointer 200000 reps @ 0.0334 msec ( 29900.0/sec): QueryPointer 1000000 trep @ 0.0335 msec ( 29900.0/sec): QueryPointer 3.8.0-0.rc5.git0.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:50:58 2013 GtkEntry - time: 0.09 GtkComboBox - time: 1.22 GtkComboBoxEntry - time: 1.08 GtkSpinButton - time: 0.64 GtkProgressBar - time: 0.54 GtkToggleButton - time: 0.59 GtkCheckButton - time: 0.13 GtkRadioButton - time: 0.16 GtkTextView - Add text - time: 0.20 GtkTextView - Scroll - time: 0.62 GtkDrawingArea - Lines - time: 0.50 GtkDrawingArea - Circles - time: 0.35 GtkDrawingArea - Text - time: 0.20 GtkDrawingArea - Pixbufs - time: 0.49 --- Total time: 6.82 Sync time adjustment is 0.2343 msecs. 200000000 reps @ 0.0000 msec (29500000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29500000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29600000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29400000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29400000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (29500000.0/sec): X protocol NoOperation 60000 reps @ 0.0963 msec ( 10400.0/sec): QueryPointer 60000 reps @ 0.0931 msec ( 10700.0/sec): QueryPointer 60000 reps @ 0.0850 msec ( 11800.0/sec): QueryPointer 60000 reps @ 0.0935 msec ( 10700.0/sec): QueryPointer 60000 reps @ 0.0665 msec ( 15000.0/sec): QueryPointer 300000 trep @ 0.0869 msec ( 11500.0/sec): QueryPointer 3.8.0-0.rc5.git1.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 10:10:01 2013 GtkEntry - time: 0.10 GtkComboBox - time: 1.57 GtkComboBoxEntry - time: 1.49 GtkSpinButton - time: 0.64 GtkProgressBar - time: 0.55 GtkToggleButton - time: 0.60 GtkCheckButton - time: 0.14 GtkRadioButton - time: 0.17 GtkTextView - Add text - time: 0.20 GtkTextView - Scroll - time: 0.64 GtkDrawingArea - Lines - time: 0.49 GtkDrawingArea - Circles - time: 0.33 GtkDrawingArea - Text - time: 0.19 GtkDrawingArea - Pixbufs - time: 0.55 --- Total time: 7.67 Sync time adjustment is 0.0854 msecs. 200000000 reps @ 0.0000 msec (26100000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (28600000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29500000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29500000.0/sec): X protocol NoOperation 200000000 reps @ 0.0000 msec (29200000.0/sec): X protocol NoOperation 1000000000 trep @ 0.0000 msec (28500000.0/sec): X protocol NoOperation 70000 reps @ 0.0911 msec ( 11000.0/sec): QueryPointer 70000 reps @ 0.0694 msec ( 14400.0/sec): QueryPointer 70000 reps @ 0.0812 msec ( 12300.0/sec): QueryPointer 70000 reps @ 0.0905 msec ( 11000.0/sec): QueryPointer 70000 reps @ 0.0538 msec ( 18600.0/sec): QueryPointer 350000 trep @ 0.0772 msec ( 13000.0/sec): QueryPointer intel: x11perf -noop -pointer 3.7.4-204.fc18.x86_64 --------------------- GtkPerf 0.40 - Starting testing: Wed Jan 30 14:49:59 2013 GtkEntry - time: 0.07 GtkComboBox - time: 1.01 GtkComboBoxEntry - time: 0.83 GtkSpinButton - time: 0.17 GtkProgressBar - time: 0.14 GtkToggleButton - time: 0.16 GtkCheckButton - time: 0.07 GtkRadioButton - time: 0.10 GtkTextView - Add text - time: 0.17 GtkTextView - Scroll - time: 0.13 GtkDrawingArea - Lines - time: 1.24 GtkDrawingArea - Circles - time: 0.89 GtkDrawingArea - Text - time: 0.86 GtkDrawingArea - Pixbufs - time: 0.17 --- Total time: 6.01 Sync time adjustment is 0.0731 msecs. 80000000 reps @ 0.0001 msec (14500000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (18200000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (18100000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (18500000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (18300000.0/sec): X protocol NoOperation 400000000 trep @ 0.0001 msec (17400000.0/sec): X protocol NoOperation 300000 reps @ 0.0186 msec ( 53700.0/sec): QueryPointer 300000 reps @ 0.0188 msec ( 53300.0/sec): QueryPointer 300000 reps @ 0.0183 msec ( 54600.0/sec): QueryPointer 300000 reps @ 0.0188 msec ( 53300.0/sec): QueryPointer 300000 reps @ 0.0208 msec ( 48100.0/sec): QueryPointer 1500000 trep @ 0.0191 msec ( 52500.0/sec): QueryPointer 3.8.0-0.rc4.git3.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 14:59:53 2013 GtkEntry - time: 0.06 GtkComboBox - time: 1.16 GtkComboBoxEntry - time: 0.87 GtkSpinButton - time: 0.13 GtkProgressBar - time: 0.12 GtkToggleButton - time: 0.16 GtkCheckButton - time: 0.06 GtkRadioButton - time: 0.10 GtkTextView - Add text - time: 0.17 GtkTextView - Scroll - time: 0.13 GtkDrawingArea - Lines - time: 1.46 GtkDrawingArea - Circles - time: 0.69 GtkDrawingArea - Text - time: 1.04 GtkDrawingArea - Pixbufs - time: 0.21 --- Total time: 6.37 Sync time adjustment is 0.0983 msecs. 100000000 reps @ 0.0001 msec (17800000.0/sec): X protocol NoOperation 100000000 reps @ 0.0001 msec (17700000.0/sec): X protocol NoOperation 100000000 reps @ 0.0001 msec (17400000.0/sec): X protocol NoOperation 100000000 reps @ 0.0001 msec (17700000.0/sec): X protocol NoOperation 100000000 reps @ 0.0001 msec (17500000.0/sec): X protocol NoOperation 500000000 trep @ 0.0001 msec (17600000.0/sec): X protocol NoOperation 300000 reps @ 0.0199 msec ( 50100.0/sec): QueryPointer 300000 reps @ 0.0207 msec ( 48300.0/sec): QueryPointer 300000 reps @ 0.0237 msec ( 42300.0/sec): QueryPointer 300000 reps @ 0.0203 msec ( 49300.0/sec): QueryPointer 300000 reps @ 0.0246 msec ( 40600.0/sec): QueryPointer 1500000 trep @ 0.0218 msec ( 45800.0/sec): QueryPointer 3.8.0-0.rc5.git1.1.fc19.x86_64 ------------------------------ GtkPerf 0.40 - Starting testing: Wed Jan 30 14:38:11 2013 GtkEntry - time: 0.08 GtkComboBox - time: 1.71 GtkComboBoxEntry - time: 1.28 GtkSpinButton - time: 0.18 GtkProgressBar - time: 0.17 GtkToggleButton - time: 0.18 GtkCheckButton - time: 0.07 GtkRadioButton - time: 0.11 GtkTextView - Add text - time: 0.25 GtkTextView - Scroll - time: 0.13 GtkDrawingArea - Lines - time: 1.56 GtkDrawingArea - Circles - time: 2.28 GtkDrawingArea - Text - time: 3.61 GtkDrawingArea - Pixbufs - time: 0.39 --- Total time: 12.00 Sync time adjustment is 0.6224 msecs. 80000000 reps @ 0.0001 msec (15800000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (16000000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (14300000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (15700000.0/sec): X protocol NoOperation 80000000 reps @ 0.0001 msec (16100000.0/sec): X protocol NoOperation 400000000 trep @ 0.0001 msec (15600000.0/sec): X protocol NoOperation 30000 reps @ 0.1975 msec ( 5060.0/sec): QueryPointer 30000 reps @ 0.2022 msec ( 4940.0/sec): QueryPointer 30000 reps @ 0.1993 msec ( 5020.0/sec): QueryPointer 30000 reps @ 0.2016 msec ( 4960.0/sec): QueryPointer 30000 reps @ 0.1998 msec ( 5010.0/sec): QueryPointer 150000 trep @ 0.2001 msec ( 5000.0/sec): QueryPointer 3.8.0-0.rc5.git1.1.fc19.x86_64 slub_debug=- ------------------------------------------- GtkPerf 0.40 - Starting testing: Wed Jan 30 14:45:05 2013 GtkEntry - time: 0.10 GtkComboBox - time: 1.04 GtkComboBoxEntry - time: 0.72 GtkSpinButton - time: 0.16 GtkProgressBar - time: 0.16 GtkToggleButton - time: 0.21 GtkCheckButton - time: 0.07 GtkRadioButton - time: 0.12 GtkTextView - Add text - time: 0.19 GtkTextView - Scroll - time: 0.15 GtkDrawingArea - Lines - time: 1.42 GtkDrawingArea - Circles - time: 1.14 GtkDrawingArea - Text - time: 1.03 GtkDrawingArea - Pixbufs - time: 0.21 --- Total time: 6.73 Sync time adjustment is 0.1575 msecs. 90000000 reps @ 0.0001 msec (17100000.0/sec): X protocol NoOperation 90000000 reps @ 0.0001 msec (17000000.0/sec): X protocol NoOperation 90000000 reps @ 0.0001 msec (16900000.0/sec): X protocol NoOperation 90000000 reps @ 0.0001 msec (17300000.0/sec): X protocol NoOperation 90000000 reps @ 0.0001 msec (17100000.0/sec): X protocol NoOperation 450000000 trep @ 0.0001 msec (17100000.0/sec): X protocol NoOperation 200000 reps @ 0.0497 msec ( 20100.0/sec): QueryPointer 200000 reps @ 0.0476 msec ( 21000.0/sec): QueryPointer 200000 reps @ 0.0474 msec ( 21100.0/sec): QueryPointer 200000 reps @ 0.0469 msec ( 21300.0/sec): QueryPointer 200000 reps @ 0.0463 msec ( 21600.0/sec): QueryPointer 1000000 trep @ 0.0476 msec ( 21000.0/sec): QueryPointer -- Adam Williamson Fedora QA Community Monkey IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora http://www.happyassassin.net

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More debugging feedback
by Bruno Wolff III 31 Jan '13

31 Jan '13

I have just done some updates while running 3.8.0-0.rc5.git0.1.fc19. A couple of these machines were booted with slub_debug=- . They all seemed a bit slower (based on my watching the updates and not real benchmarks) than with with the previous debug kernels. It isn't quite to show stopping slow, but it's getting close. It might be the slowness I see with debugging kernels for yum updates, is due to a combination of multiple debugging features rather than a single one.

3 5

A problem for my fedora 17 booting
by thomas1997ster 31 Jan '13

31 Jan '13

hello, Recently my fedora 17 system has a problem in booting. The error is the below: plymouthd: ply-array.c:82: ply_array_get_size:Assertion `array->element_type==PLY_ARRAY_ELEMENT_TYPE_POINTER || array->element_type==PLY_ARRAY_ELEMENT_TYPE_UINT32` failed what does it mean? thomas1997ster

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slub debug isn't that bad
by Bruno Wolff III 31 Jan '13

31 Jan '13

After doing some more yum updates, I am not finding the slub debugging in 3.8.0-0.rc4.git5.1.fc19 to be that bad. At most it is a little slower.

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Fedora Kernel Meeting Minutes for Jan 25, 2013
by Josh Boyer 25 Jan '13

25 Jan '13

============================== #fedora-meeting: Fedora Kernel ============================== Meeting started by jwb at 19:02:11 UTC. The full logs are available at http://meetbot.fedoraproject.org/fedora-meeting/2013-01-25/fedora-kernel.20… . Meeting summary --------------- * init (jwb, 19:02:32) * Checkpoint/Restore (jwb, 19:04:11) * LINK: https://fedoraproject.org/wiki/Features/Checkpoint_Restore (jwb, 19:04:22) * ACTION: jwb to discuss getting some testcases with adrianr (jwb, 19:08:48) * plan is to enable soon, without relying on CONFIG_EXPERT (small patch) (jwb, 19:09:04) * rawhide kernel debug options (jwb, 19:09:48) * lockdep + spinlock seemed fine. today has slub debug and needs feedback (jwb, 19:13:24) * coprs (jwb, 19:18:49) * ACTION: jwb to try more copr builds for kernels this/next week (jwb, 19:22:25) * open floor (jwb, 19:24:11) * administriva (jwb, 19:28:50) * rawhide on 3.8-rc4.git5. continuing through 3.8-rcX (jwb, 19:29:04) * F18/F17 on 3.7.4. 3.7.5 coming soon, with possible intel fixes for hangs (jwb, 19:29:25) * F16 heading towards EOL. possibly one final update before EOL. Please upgrade to f17/f18 (jwb, 19:29:51) Meeting ended at 19:31:14 UTC. Action Items ------------ * jwb to discuss getting some testcases with adrianr * jwb to try more copr builds for kernels this/next week * jforbes to continue with incremental debug options in rawhide Action Items, by person ----------------------- * jwb * jwb to discuss getting some testcases with adrianr * jwb to try more copr builds for kernels this/next week * jforbes * jforbes to continue with incremental debug options in rawhide * **UNASSIGNED** * (none) People Present (lines said) --------------------------- * jwb (69) * nirik (25) * jforbes (18) * davej (16) * brunowolff (5) * zodbot (3) * jsmith (1) Generated by `MeetBot`_ 0.1.4 .. _`MeetBot`: http://wiki.debian.org/MeetBot

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3.8.0-0.rc4.git3.1.fc19 (spin lock debug on) seemed OK
by Bruno Wolff III 24 Jan '13

24 Jan '13

I didn't see massive slow downs (in yum) from having spin lock debugging turned on in 3.8.0-0.rc4.git3.1.fc19.

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Help figure out the debug slowness
by Justin Forbes 22 Jan '13

22 Jan '13

As mentioned in the FUDCon kernel talk, we are trying to figure out exactly what causes the massive slowdown for some people with debug kernels. At this point, debug is completely off in the rawhide kernel. Every update this week will turn on more debug options until we find out which one is causing the slowdown. For this to work, we need people testing rawhide proper (not rawhide-nodebug). So please, if you can update daily and give us feedback when you hit a wall, we would really appreciate it. Feedback should be sent to kernel(a)lists.fedoraproject.org Thanks, Justin

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kernel January 2013