Date: Mon, 5 Mar 2007 18:17:37 GMT From: Ludger Bolmerg<lbolmerg@web.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/109936: SMP kernel performance problem on FSC TX600 Message-ID: <200703051817.l25IHbe0050649@www.freebsd.org> Resent-Message-ID: <200703051820.l25IK43p070154@freefall.freebsd.org>
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>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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