[CentOS] Patched KVM RPMs (solves 'network shutdown under heavy load')

Farkas Levente lfarkas at lfarkas.org
Mon Mar 22 11:16:47 UTC 2010

On 03/22/2010 12:12 PM, Timo Schoeler wrote:
> Hash: SHA1
> thus Farkas Levente spake:
>> On 03/22/2010 12:03 PM, Timo Schoeler wrote:
>>> Hi list,
>>> due to the necessity of having a patched KVM running, I build some new
>>> RPMs. However, only
>>> kmod-kvm-83-105.27.x86_64.rpm
>>> is important to replace the 'original' one as it's the only package that
>>> contains the patch. I didn't rename the packages, though, hopefully in
>>> order not to break the upgrade path provided to us.
>>> The patch adresses following problem:
>>> 'Fix a race condition where qemu finds that there are not enough virtio
>>> ring buffers available and the guest make more buffers available before
>>> qemu can enable notifications.' [0], the thread startet as 'network
>>> shutdown under heavy load' [1].
>>> KVM already contains the fix (since February 19th, IIRC), CentOS'
>>> packages doesn't.
>>> The RPMs can be found here:
>>> http://www.riscworks.net/CentOS/KVM/fix-virt-io-ring-buffer-race/
>> does it have an upstream (redhat) bugzilla entry?
>> it'd be better if they fix it...
> Sure, but we had the problem that it constantly crashed several
> customer's domUs, so we had to fix it ASAP. Just wanted to make it more
> convenient for people that have the same problem and can _not_ wait
> until it's fixed upstream.

then at least and src.rpm would be useful...

   Levente                               "Si vis pacem para bellum!"

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