Re: RFT: virtio_net: limit xmit polling

Roopa Prabhu
2011-06-25T19:44:50Z

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Here are the results I am getting with a Cisco 10G VIC adapter.
All tests are from the guest to an external host.

virtio-net-limit-xmit-polling/base:
TCP_STREAM: 8089Mbps
TCP_MAERTS: 9334Mbps

virtio-net-limit-xmit-polling/v0
TCP_STREAM: 8004Mbps
TCP_MAERTS: 9338Mbps

virtio-net-limit-xmit-polling/v1
TCP_STREAM: 8028Mbps
TCP_MAERTS: 9339Mbps

virtio-net-limit-xmit-polling/v2
TCP_STREAM: 8045Mbps
TCP_MAERTS: 9337Mbps

For the TCP_STREAM tests I don¹t get consistent results.
Every run gives me slightly different results. But its always between
7900Mbps to 8100Mbps.
But I also see this with the base kernel so its not related to these
patches.

Thanks,
Roopa

On 6/24/11 5:50 AM, "Roopa Prabhu" <roprabhu@cisco.com> wrote:

> Michael,
>
> I am testing this too.
> I have finished one round of testing. But am running it again just to
> confirm.
> This time I will see if I can collect some exit stats too. Will post results
> sometime this weekend.
> I am just doing TCP_STREAM and TCP_MAERTS from guest to remote host.
>
> Thanks,
> Roopa
>
>
> On 6/21/11 8:23 AM, "Tom Lendacky" <tahm@linux.vnet.ibm.com> wrote:
>
>> On Sunday, June 19, 2011 05:27:00 AM Michael S. Tsirkin wrote:
>>> > OK, different people seem to test different trees. In the hope to get
>>> > everyone on the same page, I created several variants of this patch so
>>> > they can be compared. Whoever's interested, please check out the
>>> > following, and tell me how these compare:
>>
>> I'm in the process of testing these patches. Base and v0 are complete
>> and v1 is near complete with v2 to follow. I'm testing with a variety
>> of TCP_RR and TCP_STREAM/TCP_MAERTS tests involving local guest-to-guest
>> tests and remote host-to-guest tests. I'll post the results in the next
>> day or two when the tests finish.
>>
>> Thanks,
>> Tom
>>
>>> >
>>> > kernel:
>>> >
>>> > git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
>>> >
>>> > virtio-net-limit-xmit-polling/base - this is net-next baseline to test
>>> > against virtio-net-limit-xmit-polling/v0 - fixes checks on out of capacity
>>> > virtio-net-limit-xmit-polling/v1 - previous revision of the patch
>>> > this does xmit,free,xmit,2*free,free
>>> > virtio-net-limit-xmit-polling/v2 - new revision of the patch
>>> > this does free,xmit,2*free,free
>>> >
>>> > There's also this on top:
>>> > virtio-net-limit-xmit-polling/v3 -> don't delay avail index update
>>> > I don't think it's important to test this one, yet
>>> >
>>> > Userspace to use: event index work is not yet merged upstream
>>> > so the revision to use is still this:
>>> > git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git
>>> > virtio-net-event-idx-v3
>>
>
>
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