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

"Michael S. Tsirkin" [off-list ref] 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