Re: XP guests sluggish after around 1 week of uptime

[Avi Kivity <avi@redhat.com>]

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.


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