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Date: Thu, 02 Apr 2015 19:49:55 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: Robert Watson <rwatson@FreeBSD.org>, 
 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
References: <201504012226.t31MQedN044443@svn.freebsd.org>
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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 04/02/15 18:00, Robert Watson wrote:
> 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.
> :-)
>

Hi,

I've sketched up my proposal here, please have a look.

https://reviews.freebsd.org/D2211

--HPS