Date: Thu, 2 Apr 2015 17:00:26 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Mateusz Guzik <mjguzik@gmail.com> 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> Subject: Re: svn commit: r280971 - in head: contrib/ipfilter/tools share/man/man4 sys/contrib/ipfilter/netinet sys/netinet sys/netipsec sys/netpfil/pf Message-ID: <alpine.BSF.2.11.1504021657440.27263@fledge.watson.org> In-Reply-To: <20150402153805.GD549@dft-labs.eu> References: <201504012226.t31MQedN044443@svn.freebsd.org> <1427929676.82583.103.camel@freebsd.org> <20150402123522.GC64665@FreeBSD.org> <20150402133751.GA549@dft-labs.eu> <20150402134217.GG64665@FreeBSD.org> <20150402135157.GB549@dft-labs.eu> <1427983109.82583.115.camel@freebsd.org> <20150402142318.GC549@dft-labs.eu> <20150402143420.GI64665@FreeBSD.org> <20150402153805.GD549@dft-labs.eu>
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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
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