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Re: Does XFS on hardware RAID5 have perfomance issues?

To: Adam McKenna <adam-dated-1015968510.b72b9d@xxxxxxxxxxxx>
Subject: Re: Does XFS on hardware RAID5 have perfomance issues?
From: Ray Muno <muno@xxxxxxxxxxx>
Date: Thu, 7 Mar 2002 15:50:31 -0600
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20020307212830.GX17914@xxxxxxxxxxxx>
References: <E631530D51ABD411B823009027855C5B0277CA@THOR> <20020307153401.B7904@xxxxxxxxxxx> <20020307212830.GX17914@xxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Mutt/1.3.19-current-20010622i
I am not using it as a benchmark.  This is just in followup to the person
who posted that they observed kernel compile times that seemed to be 
extremely long on a machine with RAID and XFS. 

I offered this as a comparison running on a machine that has both RAID
and non-RAID filesystems and it shows no difference at all.

On Thu, Mar 07, 2002 at 01:28:30PM -0800, Adam McKenna wrote:
> On Thu, Mar 07, 2002 at 03:34:02PM -0600, Ray Muno wrote:
> > I did a quick test of a kernel compile.
> 
> How is a kernel compile a test of disk performance?  Kernel compiles are
> generally CPU-bound, not I/O-bound.
> 
> Why don't you test it with a disk benchmarking tool?
> 
> As far as your kernel compiles, on a 4-CPU system, make -j4 will most likely
> speed things up considerably.
> 
> --Adam
=============================================================================
 
 Ray Muno                           http://www.aem.umn.edu/people/staff/muno
 University of Minnesota                          e-mail:   muno@xxxxxxxxxxx
 Aerospace Engineering and Mechanics               Phone:     (612) 625-9531
 110 Union St. S.E.                                  FAX:     (612) 626-1558
 Minneapolis, Mn 55455                  

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