Tom Lane wrote:
I attach two proposed patches: the first removes the cmpb/jne from
the x86 TAS assembly code, and the second one does the s_lock changes
enumerated as points #2, #3, #4. The first one in particular needs
more testing to see if it hurts performance on any non-Opteron x86
chips. (If so, we'd just make it conditional to x86_64.)
2x PIII 1G 2G Freebsd 6.0Beta4
8.1beta1 (2005-08-28):
N runtime: 1 85s 2 139s 4 220s
8.1beta1 (2005-08-28) + patch 1 (s_lock.h only)
N runtime: 1 89s 2 137s 4 229s
8.1beta1 (2005-08-28) + patch 2
N runtime: 1 84s 2 108s 4 214s
Observe the interesting little speed improvement for patch 2 with 2
processes (seems to be repeatable).
Let me know if you want to see vmstat output for any of these.
regards
Mark
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