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Add ADAPTIVE_GIANT to GENERIC on i386, with the intent of making it

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a standard configuration similar to [NO_]ADAPTIVE_MUTEXES.  This
feature causes Giant to be included in the set of mutexes adaptively
spun on.  It appears to have a positive effect on performance on SMP
across several workloads, including measurements of a 16% improvement
on buildworld, and 30%+ improvement for MySQL using the supersmack
benchmark with Giant over the network stack; a 6% improvement without
Giant on the network stack (as a result of less giant contention).
This commit is contained in:
Robert Watson 2004-08-11 01:34:18 +00:00
parent 87e83e7d4c
commit b505f47bef
1 changed files with 1 additions and 0 deletions
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sys/i386/conf/GENERIC
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@ -59,6 +59,7 @@ options AHC_REG_PRETTY_PRINT # Print register bitfields in debug
options AHD_REG_PRETTY_PRINT # Print register bitfields in debug
# output. Adds ~215k to driver.
options PFIL_HOOKS # pfil(9) framework
options ADAPTIVE_GIANT # Giant mutex is adaptive.
# Debugging for use in -current
options KDB # Enable kernel debugger support.