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

Timo Schoeler timo.schoeler at riscworks.net
Mon Mar 22 12:03:10 UTC 2010


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/

Best,

Timo

[0] -- http://marc.info/?l=kvm&m=126564542625725&w=2

[1] -- http://www.mail-archive.com/kvm@vger.kernel.org/msg26033.html



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