xen August 2012

xen@lists.stg.fedoraproject.org

8 participants
7 discussions

execute commands from dom0 into domU
by silviu d 06 Jun '15

06 Jun '15

Hello, I was wondering if there is a way to execute commands from dom0 into domU without loging into domU with ssh. thanks

3 2

DomU console driver not works for Fedora17 in HVM mode with Xen 4.1.2
by Wei Xu 26 Aug '12

26 Aug '12

> Hi All, > I'm try to set up and verify Xen console driver base on Fedora 17 and Xen > 4.1.2 with hvm guest mode, > i searched around and got a link, it give steps both for PV and HVM mode, > I followed the HVM guide > and upgraded my kernel to 3.5.0. > > http://www.dedoimedo.com/computers/xen-console.html > > After that, I can got console output with "xm console <dom_id>", but the > console driver is not used when I tracing the driver > with "crash" utility, by examing the "console_drivers", the console driver > is still "serial8250 console", so i wonder if I didn't > set up it properly or something else, is there someone ever experienced > it, thanks. > > crash> p *console_drivers > $10 = { > name = "ttyS\000\000\000\000\000\000\000\000\000\000\000", > write = 0xffffffff8138d5a0 <serial8250_console_write>, > read = 0, > device = 0xffffffff8138c350 <uart_console_device>, > unblank = 0, > setup = 0xffffffff81d29926 <serial8250_console_setup>, > early_setup = 0xffffffff8138ca10 <serial8250_console_early_setup>, > flags = 22, > index = 0, > cflag = 0, > data = 0xffffffff81c82640, > next = 0x0 > } > > Thanks, > Wei >

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4.2.0-rc1 available to test
by M A Young 24 Aug '12

24 Aug '12

There is a build of the first 4.2 release candidate temporarily available at http://koji.fedoraproject.org/koji/taskinfo?taskID=4346834 It doesn't have the efi version of the hypervisor, as my edits need to be tidied up a bit first, but I should put it back in again soon. Michael Young

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Xen Not Displayed in Boot Menu
by sorabh hamirwasia 13 Aug '12

13 Aug '12

Hi, I have installed "Xen" on Fedora16 host using "yum install xen" command and it has been installed properly. I can see the changes in /etc/grub2.cfg file too. But when I reboot then the entry for Xen is not listed in the boot menu. On further analyzing I found that in /etc/grub.conf there is no entry related to Xen. Do we need to modify grub.conf manually ? If yes then how to do that. ? Please help me with this. -- Regards, Sorabh

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Re: [Fedora-xen] [Xen-devel] 4.1.2 very slow without upstream patches, but fast with them, also 4.2 very slow
by Konrad Rzeszutek Wilk 07 Aug '12

07 Aug '12

On Mon, Aug 06, 2012 at 01:41:07PM +0100, Malcolm Crossley wrote: > On 06/08/12 11:12, Peter Maloney wrote: > >my AMD FX-8150 system with vanilla source code is super slow, both the > >dom0 and domUs. However, after I merge the upstream patches I found in > >the openSUSE rpm, it runs normally. > > > >I tried 4.2-unstable and it was the same. There was no rc1 when I tested > >it about 1.5 weeks ago. And 4.2 has the same horrible performance, and > >obviously those patches won't work any more since the 4.2 code looks > >completely reorganized, so I'm stuck with 4.1.2 > > > >Here is the rpm I was using at the time: > >http://download.opensuse.org/update/12.1/src/xen-4.1.2_16-1.7.1.src.rpm > > > >To see the list of the patches and what order to apply them, see the > >spec file. > > > >Please make sure this performance issue is fixed for the 4.2 release. > >And I would be happy to test whatever files you send me. > > > > > > > >_______________________________________________ > >Xen-devel mailing list > >Xen-devel(a)lists.xen.org > >http://lists.xen.org/xen-devel > I suspect you may need the following patch to improve your 4.1.2 > performance: > > http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/435493696053 > > The cache flush on every C2 transition is very expensive and causes > a large slow down. > > 4.1.3-rc3 already includes that patch so it would be worth testing > that version. MA Young, could this be back-ported in the F17 and F16. I belive Micahel Petullo setup a bug for that? > > Malcolm > > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel(a)lists.xen.org > http://lists.xen.org/xen-devel

3 2

Xen/Linux 3.4.2 performance
by W. Michael Petullo 02 Aug '12

02 Aug '12

We have seen a significant reduction in performance in our research DomU OS kernel when running on Fedora 16 with Linux 3.4.2 vs. 3.3.7. We run a series of benchmarks which are DomU-kernel-space-CPU-heavy; many of these run 10x slower when using the 3.4.2 Linux kernel as Dom0. This is a little surprising---we've been tracking the Fedora kernels for a long time with no problem like this. Did anyone else notice any changes? -- Mike :wq

4 11

Re: [Fedora-xen] Xen Test Day
by Dario Faggioli 02 Aug '12

02 Aug '12

On Thu, 2012-07-26 at 09:23 -0400, Konrad Rzeszutek Wilk wrote: > Would it make sense to conjoin it with the amazon ec2 day? > It sounds like it could make sense, the only problem being (sorry) I'm not sure I know or can find out what the "amazon ec2 day" is or is supposed to be... :-) Did you mean something like proposing an EC2 TestDay? Thanks and Regards, Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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xen August 2012