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

["info@xxxxxxxxxxxxxxxxxxxx" <info@xxxxxxxxxxxxxxxxxxxx>]

Hello Jordi,

the CPU is a Xeon E5310:

Output from cat /proc/cpuinfo
---- schnipp -----
model name      : Intel(R) Xeon(R) CPU           E5310  @ 1.60GHz
---- schnapp ----

Hope, I could help you.

Greetz
Dietmar Simons


Jordi Segues schrieb:
> 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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