Date: Fri, 1 Feb 2002 00:28:35 -0800 From: Alfred Perlstein <bright@mu.org> To: Luigi Rizzo <rizzo@icir.org> Cc: Terry Lambert <tlambert2@mindspring.com>, Mike Silbersack <silby@silby.com>, Storms of Perfection <gary@outloud.org>, thierry@herbelot.com, replicator@ngs.ru, hackers@FreeBSD.org Subject: Re: Clock Granularity (kernel option HZ) Message-ID: <20020201002835.I18604@elvis.mu.org> In-Reply-To: <20020201002339.C48439@iguana.icir.org>; from rizzo@icir.org on Fri, Feb 01, 2002 at 12:23:39AM -0800 References: <20020131172729.X38382-100000@patrocles.silby.com> <3C59E873.4E8A82B5@mindspring.com> <20020201002339.C48439@iguana.icir.org>
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* Luigi Rizzo <rizzo@icir.org> [020201 00:25] wrote: > On Thu, Jan 31, 2002 at 04:59:31PM -0800, Terry Lambert wrote: > > > > You will get a factor of 6 (approximately) improvement in > > throughput vs. overhead if you process packets to completion > > at interrupt, and process writes to completion at write time > > from the process. > > this does not match my numbers. e.g. using "fastforwarding" > (which bypasses netisrs's) improves peak throughput > by a factor between 1.2 and 2 on our test boxes. Forwarding packets is a lot less complicated than doing tcp recieve and send. I haven't seen Terry's stuff in action, however it makes sense that tcp would see more of an improvement than simple IP forwarding. -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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