RE: [Xen-users] GPLPV and disk speed

To:	"Steffen Heil" <lists@xxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-users] GPLPV and disk speed
From:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date:	Wed, 27 Aug 2008 11:54:17 +1000
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Thread-topic:	[Xen-users] GPLPV and disk speed

> Something I found testing the lastest gplpv drivers just got my
attention
> again:
> 
> Without gplpv drivers, disk throughput is at 27mb/s (r+w).
> With gplpv drivers, it reaches 56/45mb/s (r/w).
> No surprise, I expected gplpv to be faster than qemu.
> 
> These values were measured using PassMark Performance Test 6.0.
> 
> What surprises me is the "Disk - Zufallssuche + LS" result:
> Witout gplpv it reaches 31mb/s while gplpv drivers only reach 5mb/s.
> 
> I've attached the result.
> Can someone explain this?

What backend are you using? tap:,  phy:, or file:? It may be that the
backend is caching...

James

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RE: [Xen-users] GPLPV and disk speed