Fujitsu Siemens TX600 S3 performance issue

[Ludger Bolmerg]

> > I installed FreeBSD 6.2 on a Fujitsu Siemens TX600 S3 with 2 dual core
> > Xeon processors and 4G RAM.
> > 
> > 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.
> 
> First, what exactly is slower: CPUs, I/O or something else? Run a CPU
> benchmark before/after (ubench is a simple one), and also a disk
> benchmark (e.g. bonnie++) before/after and compare.
Haven't run a benchmark yet, but a simple dd from disks results in
 # dd if=/dev/amrd1s1 of=/dev/null bs=1k count=10000
10000+0 records in
10000+0 records out
10240000 bytes transferred in 3.325891 secs (3078874 bytes/sec)
which seems quite reasonable to me

> Do you use powerd?
powerd is not used

> Did you change timecounters? 
No

This looks like a Pentium4-type Xeon, did
> you try toggling hyperthreading? (also in BIOS?) 
No, not yet
> Does "vmstat -i" output
> suggest an interrupt storm?
This is vmstat -i after 24 minutes on an idle machine. 
# vmstat -i;w
interrupt                          total       rate
irq14: ata0                           47          0
irq16: uhci0                       11435          7
irq18: uhci2                       10692          7
irq23: ehci0                           1          0
irq48: bge0                         2569          1
irq86: amr0                        11068          7
cpu0: timer                      2857629       1998
cpu1: timer                      2855764       1997
cpu2: timer                      2854477       1996
cpu3: timer                      2854477       1996
Total                           11458159       8012

 3:32PM  up 24 mins, 1 user, load averages: 0.00, 0.00, 0.03
USER             TTY      FROM              LOGIN@  IDLE WHAT
gr172            p0       192.168.82.35     3:11PM     - w



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