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Old 02-11-2011, 01:53 PM
Tim Gardner
Default SRU: KVM: add schedule check to napi_enable call

On 02/11/2011 02:31 AM, Stefan Bader wrote:

On 02/05/2011 09:20 PM, Ken Stailey wrote:

SRU Justification:

Impact: Under heavy network I/O load virtio-net driver crashes making VM guest unusable.

Testcase: I left a current Lucid VM running two concurrent "scp -r" of> 200 GB from NFS read-only source to a physical remote host overnight. VM quickly started emitting "page allocation errors" in the system log. Next morning when I checked the VM I could still ping it but could not establish an SSH connection.

Fix: This patch from Bruce Rogers at Novell

 * [PATCH] KVM: add schedule check to napi_enable call
- http://kerneltrap.org/mailarchive/linux-netdev/2010/6/4/6278660

BugLink: https://bugs.launchpad.net/bugs/579276

The change is now upstream as

commit 3e9d08ec0a68f6faf718d5a7e050fe5ca0ba004f
Author: Bruce Rogers<brogers@novell.com>
Date: Thu Feb 10 11:03:31 2011 -0800

virtio_net: Add schedule check to napi_enable call

The change looks reasonable and has been verified. So I would add this to
Maverick and Lucid.

Acked-by: Stefan Bader<stefan.bader@canonical.com>

Yeah, I thought it looked right as well.

Tim Gardner tim.gardner@canonical.com

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