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Re: [Xen-users] [Xen-devel] Performance test regarding xenstored

On Wed, Sep 04, 2013 at 03:47:28PM +0530, Mohit Dhingra wrote:
> Hello,
> I am running a mail benchmark test using smtp-source[1] with VM running
> postfix on Xen hypervisor. My system configuration is:
> uname -a ->
> Linux cadlab 3.1.10-1.19-xen #1 SMP Mon Feb 25 10:32:50 UTC 2013 (f0b13a3)
> x86_64 x86_64 x86_64 GNU/Linux
> I am observing a very high disk write usage by xenstored (some 5 Mbps)
> without even anything running on the VM. Is it normal?
> During test, I increase the mail request rate and I see that xenstored
> usage going down as I increase the workload more and more. Basically, after
> certain point, delays in the mail starts getting increased and I am
> suspecting the disk usage to be the reason for this. However, at the time
> of saturation, disk usage by VM comes out to be around 1 Mbps. So, I am not
> sure that why it is not able to take more disk bandwidth. Has it something
> to do with xenstored. Can someone please give some insights?

I don't see a connection between xenstored and disk I/O.

Xenstored is used for configuring VMs. It should not be involved when a
process inside VM is running.

Probably you're talking about something else?


> [1] http://www.postfix.org/smtp-source.1.html
> *
> ----------------------------
> Thanks & Regards
> Mohit Dhingra
> +919611190435*

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