Xen users - Aug 2008 - GPLPV and disk speed

Hi

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?

Regards,
  Steffen




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> 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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