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


I am using xen kernel 3.1.10. I think it is xenstored only, following is the log from "iotop" command:

22:21:36  4493 be/4 root        0.00 K/s 4562.15 K/s  0.00 %  0.00 % xenstored --pid-file=/var/run/xenstored.pid

It says 4562.15 K/s as the disk write speed and no read. I am not sure why is it happening. I have enabled sync option on the disk partition where VM file resides.

/dev/disk/by-id/ata-ST31000528AS_9VP9NG6C-part9 /srv                 ext4       defaults,sync              1 2

Thanks & Regards
Mohit Dhingra 

On 4 September 2013 16:40, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
On Wed, Sep 4, 2013 at 11:17 AM, Mohit Dhingra <mohitdhingras@xxxxxxxxx> 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?

Just to check, what version of Xen are you running?

I think that XenServer has xenstored write all transactions to a log
by default; I didn't think that upstream Xen did that.

If you are using XenServer, then you need to ask this question on the
XenServer development list:


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