Re: [Xen-users] Network and processing performances

To:	jim burns <jim_burn@xxxxxxxxxxxxx>
Subject:	Re: [Xen-users] Network and processing performances
From:	Andreï V. Fomitchev <fomitchev@xxxxxxxx>
Date:	Wed, 4 Jun 2008 00:13:50 -0700 (PDT)
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Hi,

Thank you Jim for your response. Yes, I use the VBD.

Best regards,

--- En date de : Mer 4.6.08, jim burns <jim_burn@xxxxxxxxxxxxx> a écrit :

De: jim burns <jim_burn@xxxxxxxxxxxxx>
Objet: Re: [Xen-users] Network and processing performances
À: fomitchev@xxxxxxxx
Date: Mercredi 4 Juin 2008, 4h33

On Tuesday June 03 2008 08:36:28 am Andreï V. Fomitchev wrote:
> 2) global DomX performances
> Using lmbench and phoronix benchmark suites, I noted that sometimes the
> DomU performances are better that Dom0. For example, Lame compression:
146s
>
 for DomU and 151s for Dom0
> GZip compression: 134.50s for DomU and 350.29s for Dom0(!!!), i.e. DomU is
> 160% faster that Dom0 LMBench pipe bandwidth communication: 1186 MBytes/s
> for DomU and 415 MBytes/s for Dom0. I does not understand the observed
> behaviours. Please, someone can explain me the differences?

If you are using file backed vbds (using file: in your config's disk=
line), 
you may be seeing effects of dom0 caching your image.

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Re: [Xen-users] Network and processing performances