tree 8f65cee85a21a549b48846650822ca1275e6c85a
parent 4dd33d9c322d3be167c3d672aebf6108f4f7889b
author Willy Tarreau <w@1wt.eu> 1671434157 +0100
committer Willy Tarreau <w@1wt.eu> 1671544272 +0100
encoding latin1

MINOR: pool: make the thread-local hot cache size configurable

Till now it was only possible to change the thread local hot cache size
at build time using CONFIG_HAP_POOL_CACHE_SIZE. But along benchmarks it
was sometimes noticed a huge contention in the lower level memory
allocators indicating that larger caches could be beneficial, especially
on machines with large L2 CPUs.

Given that the checks against this value was no longer on a hot path
anymore, there was no reason for continuing to force it to be tuned at
build time. So this patch allows to set it by tune.memory-hot-size.

It's worth noting that during the boot phase the value remains zero so
that it's possible to know if the value was set or not, which opens the
possibility that we try to automatically adjust it based on the per-cpu
L2 cache size or the use of certain protocols (none of this is done yet).