On Mon, Apr 23, 2001 at 09:35:34PM +0100, D . W . Howells wrote:
> This patch (made against linux-2.4.4-pre6) makes a number of changes to the
> rwsem implementation:
>
> (1) Everything in try #2
>
> plus
>
> (2) Changes proposed by Linus for the generic semaphore code.
>
> (3) Ideas from Andrea and how he implemented his semaphores.
I benchmarked try3 on top of pre6 and I get this:
----------------------------------------------
RWSEM_GENERIC_SPINLOCK y in rwsem-2.4.4-pre6 + your latest #try3
rw
reads taken: 5842496
writes taken: 3016649
reads taken: 5823381
writes taken: 3006773
r1
reads taken: 13309316
reads taken: 13311722
r2
reads taken: 5010534
reads taken: 5023185
ro
reads taken: 3850228
reads taken: 3845954
w1
writes taken: 13012701
writes taken: 13021716
wo
writes taken: 1825789
writes taken: 1802560
----------------------------------------------
RWSEM_XCHGADD y in rwsem-2.4.4-pre6 + your latest #try3
rw
reads taken: 5789542
writes taken: 2989478
reads taken: 5801777
writes taken: 2995669
r1
reads taken: 16922653
reads taken: 16946132
r2
reads taken: 5650211
reads taken: 5647272
ro
reads taken: 4956250
reads taken: 4959828
w1
writes taken: 15431139
writes taken: 15439790
wo
writes taken: 813756
writes taken: 816005
graph updated attached. so in short my fast path is still quite faster (r1/w1),
slow path is comparable now (I still win in all tests but wo which is probably
the less interesting one in real life [write contention]). I still have room to
improve the wo test [write contention] by spending more icache btw but it
probably doesn't worth.
Andrea
--a8Wt8u1KmwUX3Y2C
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