kern/109936: SMP kernel performance problem on FSC TX600
lbolmerg at web.de
Mon Mar 5 18:20:04 UTC 2007
>Synopsis: SMP kernel performance problem on FSC TX600
>Arrival-Date: Mon Mar 05 18:20:03 GMT 2007
>Originator: Ludger Bolmerg
FreeBSD bsd60.myname.de 6.2-RELEASE-p2 FreeBSD 6.2-RELEASE-p2 #1
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
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
also results in good performance. Disabling single CPUs didn't work. I had to apply a patch provided by John Baldwin.
Disabling all but one CPU also gives good performance. As soon as the second CPU gets enabled it becomes slow again.
Install on same hardware
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