Re: [Xen-users] Re: [Fedora-xen] another xen build and pvops kernel

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Oct 21, 2010 at 04:40:52AM -0700, Boris Derzhavets wrote:
> Actually, i would be glad to be wrong about performance numbers.
> Following bellow is how i set up 2.6.34.7 as bzImage under Xen 4.0.1
> on top of Ubuntu 10.10 ( Server or Desktop).
> 
> http://bderzhavets.wordpress.com/2010/10/17/xenlinux-kernel-2-6-34-7-aka-suse-under-xen-4-0-1-on-top-of-ubuntu-10-10-desktop/
> 

It's more about your *pvops* config, not xenlinux config.

-- Pasi

> Boris.
> 
> --- On Thu, 10/21/10, Boris Derzhavets <bderzhavets@xxxxxxxxx> wrote:
> 
>   From: Boris Derzhavets <bderzhavets@xxxxxxxxx>
>   Subject: [Xen-users] Re: [Fedora-xen] another xen build and pvops kernel
>   To: "Pasi Kärkkäinen" <pasik@xxxxxx>
>   Cc: xen@xxxxxxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
>   Date: Thursday, October 21, 2010, 1:49 AM
> 
>   > - How did you measure this performance difference?
>        Database server running on  PV DomU with intensive I/O.
>        Workload connected with loading and unloading tables
>        to/from ASCII files residing on the guest's  image.
>    > - Did you make sure kernel configuration is similar for both kernel 
> types?
>    > Many pvops .configs have various debugging options enabled that kill the 
> performance..
> 
>   It's my personal impression. I am not an expert in PVOPS config tuning, but
>   try to avoid debugging options.
> 
>   Boris.
> 
>   --- On Wed, 10/20/10, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> 
>     From: Pasi Kärkkäinen <pasik@xxxxxx>
>     Subject: Re: [Fedora-xen] another xen build and pvops kernel
>     To: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
>     Cc: xen@xxxxxxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
>     Date: Wednesday, October 20, 2010, 1:42 PM
> 
>     On Mon, Oct 18, 2010 at 07:49:29AM -0700, Boris Derzhavets wrote:
>     >    Just wondering why [1]kernel-2.6.32.23-170.xendom0.fc12.src.rpm 
> cannot
>     >    make itself
>     >    into F14. It seems pretty stable. Why it cannot be just a package
>     >    available via "yum install" . Anyway Fedora's Libvirt has the best
>     >    compatibility with Xen 4.0.1.
>     >    It's not too late switch back to Xen with PVOPS kernel. XenLinux 
> 2.6.34.7
>     >    aka Suse
>     >    is really dangerous . It outperforms pvops kernel about 15-20 % 
> under Xen
>     >    4.0.1.
>     >
> 
>     - How did you measure this performance difference?
>     - Did you make sure kernel configuration is similar for both kernel types?
>     Many pvops .configs have various debugging options enabled that kill the 
> performance..
> 
>     -- Pasi
> 
>     >    I don't mention KVM performance. It's not a competitor for OpenSuse 
> 11.3
>     >    after the
>     >    most recent "zypper update"
>     >
>     >    Boris.
>     >
>     >    --- On Mon, 10/18/10, M A Young <m.a.young@xxxxxxxxxxxx> wrote:
>     >
>     >      From: M A Young <m.a.young@xxxxxxxxxxxx>
>     >      Subject: Re: [Fedora-xen] another xen build
>     >      To: xen@xxxxxxxxxxxxxxxxxxxxxxx
>     >      Date: Monday, October 18, 2010, 6:17 AM
>     >
>     >      There is less urgency to test now because 4.0.1-6.fc14 has now 
> made it
>     >      into F14 in time for the release. You can of course continue to 
> test if
>     >      you want to.
>     >
>     >          Michael Young
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