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From: "Fischer, Anna" <anna.fischer@hp.com>
To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Network I/O performance
Date: Tue, 12 May 2009 00:28:24 +0000	[thread overview]
Message-ID: <0199E0D51A61344794750DC57738F58E66BBF927A9@GVW1118EXC.americas.hpqcorp.net> (raw)

I am running KVM with Fedora Core 8 on a 2.6.23 32-bit kernel. I use the tun/tap device model and the Linux bridge kernel module to connect my VM to the network. I have 2 10G Intel 82598 network devices (with the ixgbe driver) attached to my machine and I want to do packet routing in my VM (the VM has two virtual network interfaces configured). Analysing the network performance of the standard QEMU emulated NICs, I get less that 1G of throughput on those 10G links. Surprisingly though, I don't really see CPU utilization being maxed out. This is a dual core machine, and mpstat shows me that both CPUs are about 40% idle. My VM is more or less unresponsive due to the high network processing load while the host OS still seems to be in good shape. How can I best tune this setup to achieve best 
 possible performance with KVM? I know there is virtIO and I know there is PCI pass-through, but those models are not an option for me right now.

             reply	other threads:[~2009-05-12  0:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-12  0:28 Fischer, Anna [this message]
2009-05-13  7:23 ` Network I/O performance Avi Kivity
2009-05-13 15:56   ` Fischer, Anna
2009-05-17 21:14     ` Avi Kivity
2009-05-19  1:30       ` Herbert Xu
2009-05-19  4:53         ` Avi Kivity
2009-05-19  7:18       ` tun/tap and Vlans (was: Re: Network I/O performance) Lukas Kolbe
2009-05-19  7:45         ` tun/tap and Vlans Avi Kivity
2009-05-19 19:46           ` Lukas Kolbe
2009-05-20 10:25           ` Fischer, Anna
2009-05-20 10:38             ` Avi Kivity
2009-05-19 21:22       ` Does KVM suffer from ACK-compression as you increase the number of VMs? Andrew de Andrade
2009-05-20 10:15       ` Network I/O performance Fischer, Anna

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