Re: XP guests sluggish after around 1 week of uptime

Avi Kivity
2009-01-19T10:09:42Z

jmandawg wrote:
> It's definitely some kind of Disk IO problem, I can't even copy a 700MB file
> on that guest without waiting a loooong time. Running bonnie on my linux
> guest shows considerable slow down in disk performance.
>
> Results after a fresh Reboot of the Host:
>
> root@wserver:~# cat bonnieresults.txt
> Version 1.03b ------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
> wserver 1G 10617 23 12241 1 10328 2 47915 93 301061 93 5095
> 98
> ------Sequential Create------ --------Random
> Create--------
> -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
> %CP
> 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++
> +++
> wserver,1G,10617,23,12241,1,10328,2,47915,93,301061,93,5094.8,98,16,+++++,++
> +, +++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
>
> Results after noticing considerable slow down on other guest machine:
>
> root@wserver:~# cat bonnieresults_SLOW.txt
> Version 1.03b ------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
> wserver 1G 2252 3 3771 0 6844 1 46057 70 355858 50 752.3
> 7
> ------Sequential Create------ --------Random
> Create--------
> -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
> files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
> %CP
> 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++
> +++
> wserver,1G,2252,3,3771,0,6844,1,46057,70,355858,50,752.3,7,16,+++++,+++,++++
> +, +++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
>
> After a reboot of the host, they guest are fine again, but for how long...
>
> Any advice or suggestions?
>

What does 'top' show for the guests? I'm interested in qemu's VIRT and
RES columns.

Also, 'vmstat 1' on host and guest while slow copying is happening.