Re: [Xen-users] Poor performance with Fibre-channel in domU and dom0

["Jordi Segues" <jordisd.mailing@xxxxxxxxx>]

Hello,

Could you specify the exact model of your quad-core xeon cpu please?
I'm looking for VT processors well recognized.
Is it a Xeon E5300, or Xeon X5300 family?

Thanks for your answer, and sorry not to help with your issue.

Jordi Segues


On 2/15/07, Simons IT-Service <info@xxxxxxxxxxxxxxxxxxxx> wrote:
> Am Donnerstag, den 15.02.2007, 12:26 +0800 schrieb Tim Post:
> > On Wed, 2007-02-14 at 17:20 +0100, Simons IT-Service wrote:
> > > Hello,
> > >
> > > I have a server with 4GB of Memory, two Intel QuadCore Xeon CPUs and a LSI 
> FibreChannel 4GBit HBA Card connected to a SAN-Box.
> > >
> > > When I install this with a normal Linux (CentOS 4.4) with kernel 
> 2.6.9-42.0.3.ELsmp and the mptfc driver, which is deliverd with this kernel, 
> everything works fine.
> > >
> > > I can copy a 600 MB file from one directory to an other on the same 
> partition in 6 seconds.
> > >
> > > When I install on the same server a Xen-kernel (2.6.16.29-xen) with the 
> mptfc driver, which is deliverd with this kernel, the I/O performance to the SAN is 
> very,very,very slow.
> > >
> > > When I copy in a domU a 600 MB file from one directory to an other on the 
> same partition it take 90 seconds.
> > >
> > > The config file for the disk in my domU is this:
> > >
> > > disk = [ 'phy:/dev/OracleVG/OraAdmin10gR2,/dev/sda1,w', 
> 'phy:/dev/OracleVG/OraDumps10gR2,/dev/sda2,w', 
> 'phy:/dev/OracleVG/OraProduct10gR2,/dev/sda3,w', 
> 'phy:/dev/OracleVG/OraSoftware10gR2,/dev/sda4,w', 
> 'phy:/dev/OraDataVG/pdevkh1,/dev/sdb1,w', 'phy:/dev/OraDataVG/pskh,/dev/sdb2,w', 
> 'phy:/dev/OraDataVG/temp,/dev/sdb3,w', 'phy:/dev/sda13,/dev/sdc1,w' ]
> > >
> >
> > I'm not 100% sure its going to *significantly* improve things, but
> > giving the dom-u some swap space may help, unless this one :
> >
> > 'phy:/dev/sda13,/dev/sdc1,w'
> >
> > is handling swap locally, but it looks like it may be the boot vbd,
> > unless sda1 also contains the root filesystem for the guest?
> >
> > Best,
> > --Tim
> >
>
> Hello Tim,
>
> thanks for your answer.
>
> Every DomU in my solution have a 2 GB Swap
> ('phy:/dev/sda13,/dev/sdc1,w') for him self.
>
> And every Dom0 and DomU boot over NFS, I use openQRM 3.1.2 from
> www.openqrm.org
>
> Any idea?
>
> Best
> Dietmar Simons
> (Neuss, Germany)
>
>
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