Messages in this thread | | | Date | Wed, 26 Feb 2003 13:16:15 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [Lse-tech] [PATCH] New dcache / inode hash tuning patch |
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>> It actually seems a fraction slower (see systimes for Kernbench-16, >> for instance). > > Can you play a bit with the hash table sizes? Perhaps double the > dcache hash and half the inode hash ?
I quadrupled the dcache hash size ... helped a bit. Is still a little slower, which I don't understand ... your plan should make it go faster, AFAICS. Those off-node accesses to ZONE_NORMAL are really expensive for me.
Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus) Elapsed User System CPU 2.5.62-mjb3 44.24 558.12 94.17 1473.83 2.5.62-mjb3-andi 44.28 557.90 95.79 1475.67 2.5.62-mjb3-andi-4x 44.20 557.96 94.77 1475.83
Kernbench-16: (make -j N vmlinux, where N = 16 x num_cpus) Elapsed User System CPU 2.5.62-mjb3 45.19 560.95 114.77 1495.00 2.5.62-mjb3-andi 45.39 561.29 117.73 1495.67 2.5.62-mjb3-andi-4x 45.34 560.54 116.85 1493.50
> I suspect it really just needs a better hash function. I'll cook > something up based on FNV hash.
Sounds good ;-)
M.
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