Hi,
On Tue, 27 Oct 2009 11:34:57 +0200, Avi Kivity <avi@xxxxxxxxxx> 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
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