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Re: [Xen-users] Poor Windows 2003 + GPLPV performance compared to VMWare

On 18/09/12 23:20, Fajar A. Nugraha wrote:
> On Tue, Sep 18, 2012 at 8:06 PM, Adam Goryachev
> <mailinglists@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>> Could you suggest a "standard" tool which would allow me to test disk IO
>> performance (this is my initial suspicion for slow performance), and
> I'd suggest you try fio, with random read/write load, and data size at
> least twice the ammount of memory.

Thanks, will give this a go tomorrow night..

>> also CPU performance (I'm starting to suspect this too now) in both
> not sure about that one. And I'm not sure it would be useful either.
> What is your application, and what kind of load was it? If it was a
> synthetic load, then it's already a good benchmark tool. However if
> it's live load that you can't control, I suggest you try something
> like sysbench to test sql performance. I usually use sysbench with
> mysql and 1 million rows.

The load is a "live" load, it uses some sort of Database (proprietary,
non standard), and I am running a "maintenance" task of some sort which
is used regularly to do backups of the system. A very similar task is
also run when doing a "upgrade" to the program, etc.

As far as I can tell, it is creating a new "database/table" and copying
the current database/table into this new one. I assume there are the
standard transactions/locking/etc associated.

The values obtained from these processes vary significantly (as per
normal) for each data type or table.

My measurements are based on the speed of the first table in the
pre-backup process. Normal backup time for this table would be about 10
minutes, I'm usually just letting it run for about 30 seconds to a
minute, as the speed remains fairly constant throughout the process.

So, I'm currently seeing speeds of approx 2500 transactions / sec, and
"normal" should be around 7000 / sec (where normal is the speed of the
same domU under vmware ESXi, and also comparable on a standalone
physical machine (original, older machine).

For now, I'm going to try and get service pack 2 installed before I
proceed, if things are still looking bad after that, I'll proceed with
doing some performance testing to see if I can pinpoint what is causing
the slowdown (disk, cpu, ram, etc...)

Thanks again for your help and suggestions.


Adam Goryachev
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