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Re: [Xen-users] Difference performances between HVM and PV guest in hard
| Subject: | Re: [Xen-users] Difference performances between HVM and PV guest in hard disc reading |
|---|---|
| From: | Heli <helicoterus-elih@xxxxxxxx> |
| Date: | Sat, 30 May 2009 19:20:14 +0200 |
| Cc: | "Fajar A. Nugraha" <fajar@xxxxxxxxx>, xen-users list <xen-users@xxxxxxxxxxxxxxxxxxx> |
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Fajar A. Nugraha wrote: How is it possible that a PV domU returns 180 MB/sec if on a normal linux hdparm returns 45 MB/sec?On Sun, May 24, 2009 at 7:25 PM, <helicoterus-elih@xxxxxxxx> wrote:I perform some tests to get hard disc performance differences between HVM domU and a paravirtualized one (both Debian Lenny).I used hdparm ( option -t and -T) to test cache of disc and disc sequential read. Syntax is: hdparm -t|-T /dev/hda1 hdparm -t for hvm returns about 30 MB/sec, wheras hdparm -t for PV return about 180 MB/sec.This is normal. HVM by default should have MUCH lower disk throughput. That's why HVM domUs need PV drivers for both Linux (included by default on RHEL/Centos 5.3, not available yet for newer kernels) and Windows (like GPLPV).hdparm -T for hvm returns about 1247 MB/sec, wheras hdparm -T for PV return about 1183 MB/sec.-T is cached result. Repeat this several times and you should find similar output for both PV and HVM. So PV is very crazy!!!Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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