ULE vs. 4BSD in RELENG_7
josh.carroll at gmail.com
Wed Oct 24 06:39:39 PDT 2007
> 5-6% is a lot. ULE has some tuning for makeworld in -current, which
> for me reduced it to less than 1% slower than 4BSD (down from 5-10%
> slower), for the case of makeworld -j4 over nfs on a 2-CPU system with
> the sources pre-cached on the server and objects on a local file system,
> and extensive local tuning of makeworld, nfs and network drivers. I
> think the tuning in ULE was mainly for a 2-CPU system, because makeworld
> seemed to be very bad under ULE only with 2 CPUs. Apparently, it is also
> very bad with more CPUs. There are sysctls to modify the ULE tuning.
I found Kris' document here:
Which also mentions some ULE tuning. The sched_ule man page doesn't
mention what these are. Can someone point me to a document that
explains the sysctl tuning I can try?
I imagine I would want to tweak one or more of these:
But I'm not sure which to try. I did try setting kern.sched.pick_pri
to 0, but that hasn't helped the ffmpeg workload at least.
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