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Re: [Xen-users] Very slow VBD writes in domU under Linux 3.3, ok under 3.0.x

On Thu, Jun 14, 2012 at 5:21 PM, Jacek Konieczny <jajcus@xxxxxxxxxx> wrote:
> On Thu, Jun 14, 2012 at 04:49:12PM +0700, Fajar A. Nugraha wrote:
>> Asking in xen-devel might provide you with more help. However, before
>> doing so, you should test with latest -rc kernel (3.5-rc2) to make
>> sure the problem still exists in latest development version.
> Unfortunately, due to different specific requirements I am not able to
> currently try anything newer than 3.3.x, so I am wondering which change
> before 3.0 and 3.3.0 could cause that problem…
> Before trying every kernel version or git-bisect I was hoping for some
> hints that could save me some work…

The one most familiar with xen support in upstream kernel is probably
Konrad, and asking in xen-devel would (hopefully) catch other dev's
attention as well. However even if you find the problem, I doubt
there's much you can do about it as kernel 3.3 is now EOL, and fixes
would probably be on or against latest -rc kernel.

A workaround you can probably try is look at vendor-supported kernels,
e.g. Ubuntu's 3.2 kernel, as those usually have some backport fixes
from later versions.


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