Date: Mon, 5 Mar 2007 19:10:08 GMT From: Remko Lodder <remko@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/109936: SMP kernel performance problem on FSC TX600 Message-ID: <200703051910.l25JA8if073569@freefall.freebsd.org>
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The following reply was made to PR kern/109936; it has been noted by GNATS. From: Remko Lodder <remko@FreeBSD.org> To: Ludger Bolmerg <lbolmerg@web.de> Cc: freebsd-gnats-submit@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: > _______________________________________________ > freebsd-bugs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe@freebsd.org" Can you tell us what your kernel configuration is? What kind of scheduler do you use etc.. Thanks! -- Kind regards, Remko Lodder ** remko@elvandar.org FreeBSD ** remko@FreeBSD.org /* Quis custodiet ipsos custodes */
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