linux-kernel - Re: [PATCH 00/18] virtio and vhost-net performance enhancements

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Date:	Wed, 11 May 2011 22:40:42 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Carsten Otte <cotte@...ibm.com>, habanero@...ux.vnet.ibm.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	kvm@...r.kernel.org, lguest@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux390@...ibm.com, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>, steved@...ibm.com,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>,
	virtualization@...ts.linux-foundation.org,
	Shirley Ma <xma@...ibm.com>
Subject: Re: [PATCH 00/18] virtio and vhost-net performance enhancements

"Michael S. Tsirkin" <mst@...hat.com> wrote on 05/05/2011 02:20:18 AM:

> [PATCH 00/18] virtio and vhost-net performance enhancements
>
> OK, here's a large patchset that implements the virtio spec update that I
> sent earlier. It supercedes the PUBLISH_USED_IDX patches
> I sent out earlier.
>
> I know it's a lot to ask but please test, and please consider for
2.6.40 :)
>
> I see nice performance improvements: one run showed going from 12
> to 18 Gbit/s host to guest with netperf, but I did not spend a lot
> of time testing performance, so no guarantees it's not a fluke,
> I hope others will try this out and report.
> Pls note I will be away from keyboard for the next week.

I tested with the git tree (which also contains the later
additional patch), and get this error on guest:

May 11 08:06:08 localhost kernel: net eth0: Unexpected TX queue failure:
-28
May 11 08:06:08 localhost kernel: net eth0: Unexpected TX queue failure:
-28
May 11 08:06:08 localhost kernel: net eth0: Unexpected TX queue failure:
-28
May 11 08:06:08 localhost kernel: net eth0: Unexpected TX queue failure:
-28
...

The network stops after that and requires a modprobe "restart" to
get it working again. This is with the new qemu/vhost/virtio-net.

Please let me know if I am missing something.

thanks,

- KK

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