From owner-freebsd-hackers Fri Feb 1 0:24:35 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from iguana.icir.org (iguana.icir.org [192.150.187.36]) by hub.freebsd.org (Postfix) with ESMTP id E6F1737B4A2 for ; Fri, 1 Feb 2002 00:24:13 -0800 (PST) Received: (from rizzo@localhost) by iguana.icir.org (8.11.3/8.11.3) id g118Ndt48597; Fri, 1 Feb 2002 00:23:39 -0800 (PST) (envelope-from rizzo) Date: Fri, 1 Feb 2002 00:23:39 -0800 From: Luigi Rizzo To: Terry Lambert Cc: Mike Silbersack , Storms of Perfection , thierry@herbelot.com, replicator@ngs.ru, hackers@FreeBSD.org Subject: Re: Clock Granularity (kernel option HZ) Message-ID: <20020201002339.C48439@iguana.icir.org> References: <20020131172729.X38382-100000@patrocles.silby.com> <3C59E873.4E8A82B5@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3C59E873.4E8A82B5@mindspring.com> User-Agent: Mutt/1.3.23i Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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. cheers luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message