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

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-users] Disk performance on HVM domains
From: Marc Patino Gómez <mpatino@xxxxxxxxxxxx>
Date: Mon, 01 Oct 2007 17:25:31 +0200
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Hi Pasi,

thanks for your answer. Any pointers to do this?



Pasi Kärkkäinen wrote:
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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