Date: Thu, 14 Dec 2006 19:11:12 +0800 From: =?gb2312?B?zfXP/rar?= <wangxd@hhu.edu.cn> To: "'Andre Oppermann'" <andre@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: Automatic TCP send and receive socket buffer sizing Message-ID: <!&!AAAAAAAAAAAYAAAAAAAAAMpcQJtxxClKnJSFO9Cau2vCgAAAEAAAAJNL2ZMeEDBDhXX4HhqVK24BAAAAAA==@hhu.edu.cn> In-Reply-To: <366093006.18223@hhu.edu.cn>
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My FTP is 202.119.123.7. From 202.119.117/24 to it, there are two = routers. traceroute to 202.119.123.7 (202.119.123.7), 64 hops max, 40 byte = packets 1 202.119.117.254 (202.119.117.254) 0.794 ms 0.809 ms 0.882 ms 2 172.17.2.14 (172.17.2.14) 0.963 ms 0.736 ms 0.868 ms 3 202.119.123.7 (202.119.123.7) 23.467 ms 23.499 ms 23.228 ms Because the number of anonymous ftp users is unlimited, the FTP is very busy.=20 FreeBSD# w 6:59PM up 16 days, 5:12, 1 user, load averages: 0.84, 0.81, 0.76 USER TTY FROM LOGIN@ IDLE WHAT root p0 202.119.117.45 6:54PM - w My question is why Debian have used the auto-sizing buffer, but FTP's sending buffer for it is under FreeBSD and XP. My FreeBSD do not apply = the patch, it is 6.0-stable. Thanks. Wangxd -----=D3=CA=BC=FE=D4=AD=BC=FE----- =B7=A2=BC=FE=C8=CB: Andre Oppermann [mailto:andre@freebsd.org]=20 =B7=A2=CB=CD=CA=B1=BC=E4: 2006=C4=EA12=D4=C214=C8=D5 18:50 =CA=D5=BC=FE=C8=CB: =CD=F5=CF=FE=B6=AB =B3=AD=CB=CD: freebsd-net@freebsd.org =D6=F7=CC=E2: Re: Automatic TCP send and receive socket buffer sizing The log lines prove that the automatic send buffer sizing was working. On local high speed networks with very low RTT (<1ms) the effect is almost not noticeable. On links with higher bandwidth and larger RTT (>10ms Internet and Corporate WAN) there can be a very large difference. You can perform a test by transferring the same large file twice, once with auto sizing enabled and once without. A good target is the European half of FTP.FreeBSD.ORG [62.243.72.50] as it has a high bandwidth connection and the send buffer auto scaling patch installed. --=20 Andre
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