Re: [Xen-users] Help with tracing Xen performance

[Marcus Carlson <marcus.carlson@xxxxxxxxxxx>]

Hi,

Try using LVM and see if it goes any faster. Loop back isnt optimal for 
this type of things.
Marcus

Adrian Chadd wrote:
> Hi,
>
> I'm testing out the Xen-3.0.2 (source from ~week ago) to see how
> well it copes under load.
>
> My current setup:
>
> * server: 2ghz Athlon, 2gb RAM, 2x200gig ATA100 disks, software
>   mirrored
> * 14 domU - each with 1gb RAM, 1gb swap, 128mb RAM
> * domUs: ext3 root filesystems on an ext3 dom0 data partition
>
> * Run 13 domU's in looped kernel builds. The CPU is maxed but the
>   disk IO stays low (under a megabyte a second.)
>
> * Run a 'find /' in one domU - the total disk throughput (vmstat 1
>   on dom0)  is slow (under a couple of megabytes a second) with
>   the find running just as slowly.
>
> * Just in case 'vmstat 1' in dom0 is lying somehow: no, the hard
>   disk activity light isn't busy. :)
>
> The other Xens aren't pushing the disk IO at all; so I'm wondering
> why the 'find /' isn't able to transfer data any faster.
>
> Does anyone have any hints where I'd start looking?
>
>
>
> Adrian
>
>
>
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>   
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