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Message-ID: <OF2BBEE530.9F02F495-ON6525788D.0057AC81-6525788D.005E1F24@in.ibm.com>
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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