Conrad Meyer 2744a0b69b Drop CACHE_LINE_SIZE to 64 bytes on x86
The actual cache line size has always been 64 bytes.

The 128 number arose as an optimization for Core 2 era Intel processors.  By
default (configurable in BIOS), these CPUs would prefetch adjacent cache
lines unintelligently.  Newer CPUs prefetch more intelligently.

The latest Core 2 era CPU was introduced in September 2008 (Xeon 7400
series, "Dunnington").  If you are still using one of these CPUs, especially
in a multi-socket configuration, consider locating the "adjacent cache line
prefetch" option in BIOS and disabling it.

Reported by:	mjg
Reviewed by:	np
Discussed with:	jhb
Sponsored by:	Dell EMC Isilon
2017-08-28 22:28:41 +00:00
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