Re: [Xen-users] XEN 3.1 on 2.6.18-164.el5xen kernel - Slow IO & Pauses

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Mon, Nov 9, 2009 at 8:17 PM, Rob Taylor <rob@xxxxxxxx> wrote:
> Well, for the most part I'm using dd if=/dev/zero of=test bs=4k
> count=1000000
>
> This writes a 4gig file to the disk.   I've tried with 100M, 200M, 400M,
> 800M, 1G, 2G, 4G file sizes.
> 100M-800M the throughput is quite impressive.
> 1G the throughput is still 100+M/sec.
> 2G+ it goes down to 1-2M/sec on DomU.

Next question: what is the allocated memory for domU and dom0? I'm
guessing around 1GB?
To get meaningful results, you should use file size about 2x available
memory. Otherwise it'd just be cached.

-- 
Fajar

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