VM wait stats

VM wait stats

[jd]

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Hi
   Is it possible to get to the following wait times ? Any plans on adding them ?

CPU wait time : Time the VM had to wait to get the processor.
similarly :
Disk I/O wait time : 
Swap I/O wait time  : 
Network I/O  :
Network I/O for storage separately ?

Page faults 

I am looking for measurements that would signify contention and would help administrators make decisions in addition to the utilization metrics.

Thanks
/Jd

 	 
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Re: VM wait stats

[Rob Gardner]

jd wrote:
> Hi
>    Is it possible to get to the following wait times ? Any plans on 
> adding them ?
> 
> CPU wait time : Time the VM had to wait to get the processor.
> 

This metric is available via Xenmon.

Rob

Re: VM wait stats

[Rik van Riel]

Rob Gardner wrote:
> jd wrote:
>> Hi
>>    Is it possible to get to the following wait times ? Any plans on 
>> adding them ?
>>
>> CPU wait time : Time the VM had to wait to get the processor
> 
> This metric is available via Xenmon.

Xenolinux also shows this as steal time in /proc/stat.

Vmstat, top, sar and other tools know how to interpret
and show the number.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.

Re: VM wait stats

[jd]

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Thanks

Any idea about the following ones.. ? 

similarly :
Disk I/O wait time : 
Swap I/O wait time  : 
Network I/O  :
Network I/O for storage separately ?

Page faults 

/Jd

Rik van Riel <riel@redhat.com> wrote: Rob Gardner wrote:
> jd wrote:
>> Hi
>>    Is it possible to get to the following wait times ? Any plans on 
>> adding them ?
>>
>> CPU wait time : Time the VM had to wait to get the processor
> 
> This metric is available via Xenmon.

Xenolinux also shows this as steal time in /proc/stat.

Vmstat, top, sar and other tools know how to interpret
and show the number.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.


 
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Xen-devel mailing list
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Re: VM wait stats

[Rik van Riel]

jd wrote:
> Thanks
> 
> Any idea about the following ones.. ?
> 
> similarly :
> Disk I/O wait time :
> Swap I/O wait time  :
> Network I/O  :
> Network I/O for storage separately ?
> 
> Page faults

These are not broken down separately.  All filesystem and
page fault I/O waiting time is expressed in one "iowait"
statistic, also in the CPU lines in /proc/stat.

And yes, vmstat, top and sar know about this one, too.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.