Chen, Kenneth W wrote:
Jens Axboe wrote on Wednesday, April 26, 2006 12:46 PM
It's interesting, single threaded performance is down a little. Is
this significant? In some other results you showed me with 3 splices
each running on their own file (ie. no tree_lock contention), lockless
looked slightly faster on the same machine.
I can do the same numbers on a 2-way em64t for comparison, that should
get us a little better coverage.
I throw the lockless patch and Jens splice-bench into our benchmark harness,
here are the numbers I collected, on the following hardware:
(1) 2P Intel Xeon, 3.4 GHz/HT, 2M L2
(2) 4P Intel Xeon, 3.0 GHz/HT, 8M L3
(3) 4P Intel Xeon, 3.0 GHz/DC/HT, 2M L2 (per core)
Here are the graph:
Thanks a lot Ken.
So pagecache lookup performance goes up about 15-25% in single threaded
tests on your P4s. Phew, I wasn't dreaming it.
It is a pity that ipf hasn't improved similarly (and even slowed down a
bit, if Jens' numbers are significant to that range). Next time I spend
some cycles on lockless pagecache, I'll try to scrounge an ipf and see
if I can't improve it (I don't expect miracles).
Thanks,
Nick
--
SUSE Labs, Novell Inc.
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