low(er) disk performance with sched_4bsd then with sched_ule

Oliver Lehmann lehmann at ans-netz.de
Thu Sep 15 09:12:25 PDT 2005

Oliver Lehmann wrote:

> Joseph Koshy wrote:
> > What happens if you use a kernel with 'options NO_ADAPTIVE_MUTEXES' ?
> I'll try this and respond back

Hmm, that made it more worse

root at nudel olivleh1> pmcstat -S instructions -c 1 -S instructions -O /tmp/4bsd.2.out dd if=/dev/zero of=/mnt/files/test.dd bs=64k count=32000
32000+0 records in
32000+0 records out
2097152000 bytes transferred in 94.441797 secs (22205761 bytes/sec)
root at nudel olivleh1> pmcstat -R /tmp/4bsd.2.out -g
root at nudel olivleh1> gprof -l /boot/kernel/kernel ./p6-inst-retired/kernel.gmon > gprof.4bsd.2
time is in ticks, not seconds
root at nudel olivleh1> 


 Oliver Lehmann

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