* performance regression in virtio-net in 2.6.32-rc4
@ 2009-10-26 18:48 Michael S. Tsirkin
2009-10-27 9:41 ` Avi Kivity
2009-10-27 23:34 ` Rusty Russell
0 siblings, 2 replies; 3+ messages in thread
From: Michael S. Tsirkin @ 2009-10-26 18:48 UTC (permalink / raw)
To: Rusty Russell; +Cc: virtualization, kvm, netdev
Hi!
I noticed a performance regression in virtio net: going from
2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
[mst@tuck ~]$ ssh robin sh streamtest1
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3
(11.0.0.3) port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.20 7806.48
[mst@tuck ~]$ ssh robin sh streamtest1
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3
(11.0.0.3) port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 6814.60
Note: I had to revert 48925e372f04f5e35fec6269127c62b2c71ab794,
and I applied a patch
virtio-pci: fix per-vq MSI-X request logic
which fixes a bug introduced by f68d24082e22ccee3077d11aeb6dc5354f0ca7f1.
Any tips on debugging this?
--
MST
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: performance regression in virtio-net in 2.6.32-rc4
2009-10-26 18:48 performance regression in virtio-net in 2.6.32-rc4 Michael S. Tsirkin
@ 2009-10-27 9:41 ` Avi Kivity
2009-10-27 23:34 ` Rusty Russell
1 sibling, 0 replies; 3+ messages in thread
From: Avi Kivity @ 2009-10-27 9:41 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: Rusty Russell, virtualization, kvm, netdev
On 10/26/2009 08:48 PM, Michael S. Tsirkin wrote:
> Hi!
> I noticed a performance regression in virtio net: going from
> 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
>
> Any tips on debugging this?
>
Lacking better advice, a bisect can help as a last resort. 'git bisect
start -- drivers/net drivers/virtio' will probably find it fastest.
--
error compiling committee.c: too many arguments to function
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: performance regression in virtio-net in 2.6.32-rc4
2009-10-26 18:48 performance regression in virtio-net in 2.6.32-rc4 Michael S. Tsirkin
2009-10-27 9:41 ` Avi Kivity
@ 2009-10-27 23:34 ` Rusty Russell
1 sibling, 0 replies; 3+ messages in thread
From: Rusty Russell @ 2009-10-27 23:34 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: virtualization, kvm, netdev
On Tue, 27 Oct 2009 05:18:35 am Michael S. Tsirkin wrote:
> Hi!
> I noticed a performance regression in virtio net: going from
> 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
...
> Size Size Size Time Throughput
> bytes bytes bytes secs. 10^6bits/sec
>
> 87380 16384 16384 10.20 7806.48
...
> 87380 16384 16384 10.00 6814.60
Hmm, needs a bisect I'd say.
Thanks,
Rusty.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-10-26 18:48 performance regression in virtio-net in 2.6.32-rc4 Michael S. Tsirkin
2009-10-27 9:41 ` Avi Kivity
2009-10-27 23:34 ` Rusty Russell
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