Hi
Kris Kennaway wrote:
One more patch which may or may not help is:
http://www.freebsd.org/~jhb/patches/namei_rwlock.patch
(may also require porting since it was against an older version of
7.0-CURRENT). When I have tested this in the past it was a performance
loss for reasons that I think I understand (basically, it is locally a
performance improvement for the name cache but also requires a fixed
lockmgr to avoid an overall performance loss), but I don't remember if I
tested it in conjunction with the lockmgr patch.
This patch doesn't apply to 7-STABLE because /sys/kern/vfs_cache.c was
changed significanly since rev. 1.108. I tried to patch it manually but
don't know what to do with cache_lookup() changes.
There are patches you need to enable it on woodcrest. They are in my
p4 branch (kris-contention) but I don't have time right now to
extract them.
I think it would be very useful because I can't see any other ways to
profile FreeBSD on the modern many-cores machines.
You can extract the changeset from my branch via
http://perforce.freebsd.org. Unfortunately I don't have time to do it
myself.
I'll try it if it does not also need porting.
With best regards,
Alexey Popov
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