kern/109936: SMP kernel performance problem on FSC TX600

[Remko Lodder]

The following reply was made to PR kern/109936; it has been noted by GNATS.

From: Remko Lodder <remko at FreeBSD.org>
To: Ludger Bolmerg <lbolmerg at web.de>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/109936: SMP kernel performance problem on FSC TX600
Date: Mon, 05 Mar 2007 20:07:02 +0100

 Ludger Bolmerg wrote:
 >> Number:         109936
 >> Category:       kern
 >> Synopsis:       SMP kernel performance problem on FSC TX600
 >> Confidential:   no
 >> Severity:       serious
 >> Priority:       high
 >> Responsible:    freebsd-bugs
 >> State:          open
 >> Quarter:        
 >> Keywords:       
 >> Date-Required:
 >> Class:          sw-bug
 >> Submitter-Id:   current-users
 >> Arrival-Date:   Mon Mar 05 18:20:03 GMT 2007
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     Ludger Bolmerg
 >> Release:        6.2
 >> Organization:
 >> Environment:
 > FreeBSD bsd60.myname.de 6.2-RELEASE-p2 FreeBSD 6.2-RELEASE-p2 #1
 >> Description:
 > I installed FreeBSD 6.2 on a Fujitsu Siemens TX600 S3 with 2 dual core Xeon processors and 4G RAM.
 > Here is the link to the data sheet of the server on Fujitsu-Siemens' Web page.  It may be helpful
 > 
 > http://extranet.fujitsu-siemens.com/vil/pc/vil/primergy/model_line_400/rack_server/ds_prim-rx600-s3.pdf
 > 
 > The SMP kernel is awfully slow.  make buildkernel takes about 6 hours to complete.  When I boot a UP kernel the build completes within 12 minutes.  I don't see any unusual message in any log file.
 > 
 > Booting the SMP kernel with kern.smp.disabled=1 shows good performance values.
 > 
 > When booting the SMP kernel with 
 > 
 > hint.lapic.10.disabled=1
 > hint.lapic.12.disabled=1
 > hint.lapic.14.disabled=1
 > 
 > also results in good performance.  Disabling single CPUs didn't work. I had to apply a patch provided by John Baldwin.
 > http://lists.freebsd.org/pipermail/freebsd-smp/2007-February/001320.html
 > 
 > Disabling all but one CPU also gives good performance. As soon as the second CPU gets enabled it becomes slow again.
 > 
 > 
 > 
 >> How-To-Repeat:
 > Install on same hardware
 >> Fix:
 > 
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
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 Can you tell us what your kernel configuration is?
 What kind of scheduler do you use etc..
 
 Thanks!
 
 -- 
 Kind regards,
 
       Remko Lodder               ** remko at elvandar.org
       FreeBSD                    ** remko at FreeBSD.org
 
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