[Xen-users] Bad Xen RAM Performance

[Martin Probst <probst@xxxxxxxxxxxxxxxxx>]

Hello there,

I have bad performance on a special DomU application. I did some benchmarks and 
wonder about bad RAM performance at my DomU. First I used Passmark because the 
application Maintainer requests it. The Values âRead cachedâ, âRead uncachedâ 
and âLarge memoryâ are very bad. To compare Dom0 and DomU, I setup a second 
DomU with linux and check them with ramspeed (a cache and memory benchmarking 
tool) for linux and other. I run several ramspeed test on dom0 and my linux and 
windows domUs. The test results on the DomUs were only about half as good as on 
Dom0.

Is there a way to increase the RAM performance on DomU? Do you have such 
problems, too?

My setup:

Dom0:
HP DL360g7
CPU:  1x Xeon E5645 @ 2.4 GHz (six core CPU)
RAM: 16 GB DDR3 RDIMM @ 1333MHz ECC
HDD: 2x 300 GB SAS 10k RAID I
OS: SLES11 SP2 with XEN 4.1.2 from suse

DomU:
Windows 2008 R2 64bit
CPUs: 4
RAM: 8GB
Virtual Disk configured with LVM

At the moment, no other DomUs running.


Thanks
Martin


i.A. Martin Probst

Informatik Team GmbH
Allensteiner Strasse 79
56566 Neuwied

Tel.: 02631/9692-15
Fax.: 02631/9692-20
www.informatikteam.de

Finanzamt Neuwied:
Steuer-Nr.: 32/660/1524/9

GeschÃftsfÃhrer:
JÃrgen A. Boos; Utz Hafner
HRB 14034; AG Montabaur

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