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Re: [Xen-users] I/O issue in xen guest OS
- To: Radu Rendec <radu.rendec@xxxxxxx>
- From: chandrashekar <chanlinux@xxxxxxxxx>
- Date: Mon, 6 Jul 2009 21:07:02 +0530
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 06 Jul 2009 08:37:51 -0700
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Radu,
Is this issue may be bcz of filesystem.............?
Thanks,
Chandru
On Mon, Jul 6, 2009 at 8:56 PM, Radu Rendec <radu.rendec@xxxxxxx> wrote:
On Mon, 2009-07-06 at 20:40 +0530, chandrashekar wrote:
> As you suggested I checked CPU % and there is no issue in CPU but I
> think this is issue with memory.
>
> Please find the xm top for the same.
>
>
> xentop - 20:35:49 Xen 3.1.2-92.el5
> 2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0
> shutdown
> Mem: 4193636k total, 4193292k used, 344k free CPUs: 8 @ 2333MHz
> NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS
> NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID
> Domain-0 -----r 23050 0.7 2200640 52.5 no limit
> n/a 8 4 248 2101165 0 0 0 0 0
> guest --b--- 3938 0.0 1945432 46.4 1945600 46.4
> 1 1 2197321 2803970 0 0 0 0 0
Chandru,
The memory seems to be (almost) equally splitted between dom0 and the
guest, and you have plenty of it.
But I think I got the explanation to your issue:
domU has only one VCPU, while dom0 has 8 CPUs; since I/O activity is
likely not to span across multiple CPUs, you have the following:
domU: 1 cpu (of 1) waiting 100% for I/O => 100% overall IOwait
dom0: 1 cpu (of 8) waiting 100% for I/0 => 1/8 * 100% overall IOwait
I think 1/8 * 100% is exactly your 12%
Cheers,
Radu
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