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Re: [Xen-users] Disk performance on HVM domains

To: Marc Patino Gómez <mpatino@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Disk performance on HVM domains
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Mon, 1 Oct 2007 18:13:24 +0300
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On Mon, Oct 01, 2007 at 01:48:41PM +0200, Marc Patino Gómez wrote:
> Hi list,
> I converted one old FreeBSD 4.9 box to HVM domU (with AMD-V processors, 
> with Intel-VT doesn't work). All works fine, but disk performance is too 
> poor... about 8MB/s (in dom0 i get about 40MB/s). I did some test with 
> VBD with file backed and LVM but performance stills poor.
> Any advices?
> Is possible to use blktap in this case? Any pointers?
> If I use a SAN, network performance on HVM will be a problem?
> What's about tgt?
> I have one HVM old linux 2.4 domU and I can get far more disk troughtput 
> than with FreeBSD, it is normal? In this case, domU is on Intel-VT Xen 
> server, is Intel-VT io implementation better than AMD?
> At now, I'm only testing, in the future I will need to virtualize some 
> old FreeBSD servers with quite great IO demand

You need to install PV (paravirtual) xen aware device drivers into FreeBSD.. 

I don't know if there is such thing.. 

-- Pasi

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