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Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
From: |
Dietmar Maurer |
Subject: |
Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores |
Date: |
Tue, 6 Nov 2012 06:48:07 +0000 |
> Is the network path you are downloading across reasonably idle so that you
> get reproducible results between runs?
Also tested with netperf (to local host) now.
Results in short (performance in Mbit/sec):
vhost=off,cores=1: 3982
vhost=off,cores=2: 3930
vhost=off,cores=4: 3912
vhost=on,cores=1: 22065
vhost=on,cores=2: 1392
vhost=on,cores=4: 532
As you can see, vhost performance drops from 22065 to 532 - this is by factor
40!
And ideas?
-- complete logs---
With vhost=off / cores=1
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 3982.74
With vhost=off / cores=2
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 3930.62
With vhost=off / cores=4
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 3912.36
With vhost=on /cores=1
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 22065.48
With vhost=on /cores=2
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 10.01 1392.61
With vhost=on /cores=4
# netperf -H maui
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com
(192.168.2.2) 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 10.05 532.31
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, (continued)
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Michael S. Tsirkin, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/13
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/15
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Dietmar Maurer, 2012/11/16
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Alexandre DERUMIER, 2012/11/16
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/19
- Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores, Peter Lieven, 2012/11/13
Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores,
Dietmar Maurer <=