83c001d3c2
Reduce the cost of TLB invalidation on x86 by using per-CPU completion flags Reduce contention during TLB invalidation operations by using a per-CPU completion flag, rather than a single atomically-updated variable. On a Westmere system (2 sockets x 4 cores x 1 threads), dtrace measurements show that smp_tlb_shootdown is about 50% faster with this patch; observations with VTune show that the percentage of time spent in invlrng_single_page on an interrupt (actually doing invalidation, rather than synchronization) increases from 31% with the old mechanism to 71% with the new one. (Running a basic file server workload.) Submitted by: Anton Rang <rang at acm.org> Reviewed by: cem (earlier version) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D8041 |
||
---|---|---|
.. | ||
acpica | ||
amd64 | ||
cloudabi32 | ||
cloudabi64 | ||
conf | ||
ia32 | ||
include | ||
linux | ||
linux32 | ||
pci | ||
vmm | ||
Makefile |