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From: Robert Watson <rwatson@FreeBSD.org>
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To: Mateusz Guzik <mjguzik@gmail.com>
Subject: Re: svn commit: r280971 - in head: contrib/ipfilter/tools
 share/man/man4
 sys/contrib/ipfilter/netinet sys/netinet sys/netipsec sys/netpfil/pf
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 Gleb Smirnoff <glebius@FreeBSD.org>, src-committers@freebsd.org,
 Ian Lepore <ian@freebsd.org>
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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