On Thu, 2 Apr 2015, Mateusz Guzik wrote:
If you carefully read the thread I referred to, you would notice that on
many arches, save amd64 and i386, all systems stats are prone to mangling
the stats due to migration within PCPU_INC. Look here:
grep '^#define PCPU_ADD' sys/*/include/pcpu.h
Do we have reports on not precise enough statistics, yet?
How many non-x86 installations with multiple cpus and high traffic are out
there?
Not sure if this was a rhetorical question or not, but: quite a few. We have
support for several highly threaded 64-bit MIPS systems including those from
Cavium and Broadcom (was NetLogic Micro was RMI). Several reference systems
are in the netperf cluster including 16- and 32-thread systems normally
deployed in high-performance network products. It's possible that ARMv8
systems will gradually displayce 64-bit MIPS systems in this arena in the
future, but hard to say. Either way, it's not x86. :-)
Robert
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