Hi,
On Tue, 27 Oct 2009 11:34:57 +0200, Avi Kivity <[email protected]> wrote: > On 10/27/2009 02:13 AM, Floris Bos wrote: >> I am running Proxmox 1.4 (which uses the 2.6.30.1 kvm modules) and am >> experiencing performance problems with Linux guests using the virtio_blk >> module. >> Especially with random IO it is a lot slower than IDE. >> > > Try switching the host I/O scheduler to deadline. You can do that at > runtime in /sys/block/.../queue. Thanks for the tip. Seems to improve random IO performance by 11 times! == Version 1.03c ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP ubuntu910 16G 38776 97 61414 5 32451 7 34711 73 95325 9 7174 23 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ ubuntu910,16G,38776,97,61414,5,32451,7,34711,73,95325,9,7174.2,23,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ == Yours sincerely, Floris Bos -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
