Re: [Xen-users] HVM on 3.2 kernel hdd speed issue

[Mario <mario@xxxxxxxxxxxxxx>]

On 04/01/2012 05:00 AM, Joseph Glanville wrote:
> On 1 April 2012 01:33, Mario<mario@xxxxxxxxxxxxxx>  wrote:
> > Hey,
> >
> > up untill recently I have been using gentoo-rebased xen patches for 2.6.34
> > kernel line, and it has been working fine. Recently i have decided to
> > upgrade few of my dom0's to 3.2 kernel, and everything seems fine except for
> > the linux guests in HVM mode. Drive read and write is painfuly slow, yet
> > windows guests on that same configuration (or any other variation) give
> > normal/expected results. Paravirtual linux guests do not seem to be
> > affected, and i have tried both 2.6 and 3.2 kernels on hvm guests but there
> > was no difference. Xen version = 4.1.2 stable.
> > Is there anything that I might be missing?
> >
> > Thanks in advance,
> > mario
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users
> Hi Mario,
>
> Are you using PVonHVM for your Linux guests? QEMU emulated disks aren't fast..
> Check that you have xen_platform_pci=1 in your config file to make
> sure PV drivers are enabled.
>
> Are you using Gentoo guests too? Make sure you compile in the Xen
> drivers if that is the case.
> I am running many Gentoo 3.2.1 guests in PVHVM mode with excellent
> disk and network performance (60k IOPs, 600mb/s+ sequentials)
>
> Joseph.
I am not using PVonHVM, any more ideas?

m.

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