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[Xen-users] Xen-4.0 and GPLPV Driver - Slow Write perf

from [ROZET Stéphane]

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Subject:	[Xen-users] Xen-4.0 and GPLPV Driver - Slow Write perf
From:	ROZET Stéphane <srozet@xxxxxxx>
Date:	Fri, 18 Feb 2011 05:34:40 -0800
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Hi,

I’m using 3 servers with XEN and 2 San. Twice have Xen3.2 and Windows VM are OK with GPLPV drivers. One server have Xen-4.0 and I have a problem with Windows VM:

Windows VM have very poor write disk performance (3 MB/s) with GPLPV driver (I tried 0.9 and 0.11 versions). Read perf are ok (~200MB/s).

Without GPLPV driver, it’s more credible, but I’m not using the best of my VM without GPLPV…

Xen host is Debian 6, with kernel 2.6.32-5. I’m using AOE, with AOEtools in version 32 and aoe driver in version 76.

What can I do for that ?

Thanks

Stéphane

Stéphane ROZET

Ingénieur réseaux et systèmes
2, rue Maurice Hartmann 92130 Issy-les-Moulineaux
Fixe : 01.55.95.94.29
Fax : 01.46.44.29.80

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