Messages in this thread | | | Date | Mon, 18 Mar 2002 00:12:40 +1100 | From | Anton Blanchard <> | Subject | some RCU dcache and ratcache results |
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> > Not for this, I did do some benchmarking of the RCU dcache patches a > > while ago which I should post. > > Please do ;-) This shows why we need to ease the pressure on dcache_lock.
OK :) Here is a graph I made a while ago. It is on a 32 way ppc64 box running dbench.
http://samba.org/~anton/linux/dcache/summary.png
rat - radix-tree pagecache patch dcache - RCU dcache patch ext2 - rusty's BKL removal from ext2 patch
Not surprisingly the RCU dcache patch gave a large improvement in dbench. While dbench may not be the greatest of benchmarks I am also seeing a lot of dcache_lock contention on large zero copy workloads (eg 8 way specweb).
> > I didnt get a chance to run lockmeter, I tend to use the kernel profiler > > and use a hacked readprofile (originally from tridge) that displays > > profile hits vs assembly instruction. Thats usually good enough to work > > out which spinlocks are a problem. > > Is this a PPC only hack ? Also, where can I get it ?
I thought tridge put it into cvs somewhere, I'll find out the details from him.
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