From owner-freebsd-net Fri Sep 21 1:28: 2 2001 Delivered-To: freebsd-net@freebsd.org Received: from fgwmail7.fujitsu.co.jp (fgwmail7.fujitsu.co.jp [192.51.44.37]) by hub.freebsd.org (Postfix) with ESMTP id A788937B414 for ; Fri, 21 Sep 2001 01:27:58 -0700 (PDT) Received: from m2.gw.fujitsu.co.jp by fgwmail7.fujitsu.co.jp (8.9.3/3.7W-MX0108-Fujitsu Gateway) id RAA29630; Fri, 21 Sep 2001 17:27:53 +0900 (JST) (envelope-from tsuchiya@flab.fujitsu.co.jp) Received: from dm.kawasaki.flab.fujitsu.co.jp by m2.gw.fujitsu.co.jp (8.9.3/3.7W-0108-Fujitsu Domain Master) id RAA28971; Fri, 21 Sep 2001 17:27:52 +0900 (JST) (envelope-from tsuchiya@flab.fujitsu.co.jp) Received: from mailserv.kawasaki.flab.fujitsu.co.jp by dm.kawasaki.flab.fujitsu.co.jp (8.9.3/3.7W-010315-Fujitsu Labs. Kawasaki Domain Mail Master) id RAA10181; Fri, 21 Sep 2001 17:27:52 +0900 (JST) Received: from flab.fujitsu.co.jp (const.kawasaki.flab.fujitsu.co.jp [10.25.159.164]) by mailserv.kawasaki.flab.fujitsu.co.jp (8.8.8+Sun/8.8.8) with ESMTP id RAA23444; Fri, 21 Sep 2001 17:27:50 +0900 (JST) Message-ID: <3BAAFA13.8040708@flab.fujitsu.co.jp> Date: Fri, 21 Sep 2001 17:28:03 +0900 From: Tsuchiya Yoshihiro User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.2) Gecko/20010727 X-Accept-Language: en-us MIME-Version: 1.0 To: Mike Silbersack Cc: net@FreeBSD.org Subject: Re: TCP performance question References: <20010921025715.U68923-100000@achilles.silby.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Mike Silbersack wrote: >On Fri, 21 Sep 2001 tsuchiya@flab.fujitsu.co.jp wrote: > >>and we changed the size from 1 to 10000 byte and measured the time of >>read/write pair on the server. Usually the measured time is >>around or less than 1 msec, however it is always 100msec when the size is >>between 2049 and 2919 byte or between 4381 and 5839 byte or >>between 7301 and 8751 byte. 100 times slower. >> > >Try disabling delayed ACKs and see how that affects your results. The >default delay for delayed acks is 100ms. > >sysctl -w net.inet.tcp.delayed_ack=0 > I found a machine with FreeBSD4.3 and tried it, but it didn't work. Yoshi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message