DomU console driver not works for Fedora17 in HVM mode with Xen 4.1.2
by Wei Xu
> 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
>
11 years, 7 months
Xen Not Displayed in Boot Menu
by sorabh hamirwasia
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
11 years, 8 months
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
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
11 years, 8 months
Xen/Linux 3.4.2 performance
by W. Michael Petullo
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
11 years, 8 months
Re: [Fedora-xen] Xen Test Day
by Dario Faggioli
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)
11 years, 8 months
