Messages in this thread | | | Date | Thu, 27 Apr 2006 16:07:34 +1000 | From | Nick Piggin <> | Subject | Re: Lockless page cache test results |
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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
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