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

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Thu, Jun 14, 2012 at 4:41 PM, Jacek Konieczny <jajcus@xxxxxxxxxx> wrote:
> Hello,
>
> After upgrading my DomUs to Linux kernel 3.3.0 I have noticed some
> applications are _inceribly_ slow. Eventually I fount out that are some
> filesystem writes blocking for long time.
>
> The problem occurs no matter if I use file-backed VBD or
> LVM-device-backed VBD, it doesn't matter if I run the domU under Xen
> 4.1.2 or under Xen 3.4.3. It does not matter if I write through
> a file system in domU or if I write directly to the xvd device.
> But the same operations work well under kernels 3.0.x, but fail in
> 3.3.x.
>
> Any ideas what is causing that? How can I prevent this in any other way
> than downgrading the domU kernel?

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.

-- 
Fajar

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