Re: [PATCH 0/3] qemu-kvm: vhost net support

[Avi Kivity <avi@redhat.com>]

On 08/20/2009 08:00 PM, Michael S. Tsirkin wrote:
>
> Surprisingly, I seem to get better-than-userspace throughput with this
> benchmark as well.  Here's a test run locally, host-to-guest,
> over a veth link:
>
> vhost:
> [root@qus19 ~]# ping -c 1000000 -f -q 11.0.0.4
> PING 11.0.0.4 (11.0.0.4) 56(84) bytes of data.
>
> --- 11.0.0.4 ping statistics ---
> 1000000 packets transmitted, 1000000 received, 0% packet loss, time 10230ms
> rtt min/avg/max/mdev = 0.005/0.006/0.035/0.000 ms, ipg/ewma 0.010/0.006 ms
>    

6 microseconds is very impressive for round-trip time.

> [root@qus19 ~]# ping -s 1024 -l 120 -c 1000000 -f -q 11.0.0.4
> PING 11.0.0.4 (11.0.0.4) 1024(1052) bytes of data.
>
> --- 11.0.0.4 ping statistics ---
> 1000000 packets transmitted, 1000000 received, 0% packet loss, time 11270ms
> rtt min/avg/max/mdev = 0.006/0.006/0.022/0.002 ms, pipe 120, ipg/ewma 0.011/0.007 ms
>
>    

That's only 100MB/sec, but understandable given the lack of interrupt 
mitigation.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.