From owner-freebsd-questions@FreeBSD.ORG Tue Jun 29 20:01:29 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1B97D16A4CE for ; Tue, 29 Jun 2004 20:01:29 +0000 (GMT) Received: from smtpout.mac.com (smtpout.mac.com [17.250.248.97]) by mx1.FreeBSD.org (Postfix) with ESMTP id CE51143D2F for ; Tue, 29 Jun 2004 20:01:26 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from mac.com (smtpin07-en2 [10.13.10.152]) by smtpout.mac.com (Xserve/MantshX 2.0) with ESMTP id i5TK1DJd026125; Tue, 29 Jun 2004 13:01:13 -0700 (PDT) Received: from [10.1.1.193] (nfw2.codefab.com [199.103.21.225] (may be forged)) (authenticated bits=0)i5TK1BMw017858; Tue, 29 Jun 2004 13:01:13 -0700 (PDT) In-Reply-To: <20040629153855.300b3888.wmoran@potentialtech.com> References: <20040629140231.7b57dedf.wmoran@potentialtech.com> <1187B403-C9FC-11D8-99F8-003065ABFD92@mac.com> <20040629153855.300b3888.wmoran@potentialtech.com> Mime-Version: 1.0 (Apple Message framework v618) Content-Type: text/plain; charset=US-ASCII; format=flowed Message-Id: <1133CD52-CA07-11D8-99F8-003065ABFD92@mac.com> Content-Transfer-Encoding: 7bit From: Charles Swiger Date: Tue, 29 Jun 2004 16:01:10 -0400 To: Bill Moran X-Mailer: Apple Mail (2.618) cc: questions@freebsd.org Subject: Re: REPOST: Performance problems with FTP X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Jun 2004 20:01:29 -0000 On Jun 29, 2004, at 3:38 PM, Bill Moran wrote: > Charles Swiger wrote: >> I haven't seen any signs of such problems with 4.10. Given that >> you've >> reproduced this using different FTP servers, it seems more likely to >> be >> a network issue or some hardware glitch (cables? flaky NIC?) than a >> software issue. > > I hadn't even considered hardware, becuase scp is always as fast as I > would expect. I wouldn't suspect a NIC or HDD, unless the problem was > consistent with _all_ file transfers, and it's not. The performance > issue only occurs with FTP. If I'm wrong on this, I'd be happy to hear > about it, though. You're not wrong, and I don't see anything obviously wrong, so I'm reaching for possibilities to check. :-) >> Can you reproduce by moving ftp to a different port #? (Perhaps some >> quality-of-service thingy is providing different bandwidth by port...) > > I haven't tried that, but I forgot to mention that a Debian box located > right next to the problem box (on the same network) gets speeds equal > to what would be expected. To me, that ruled out QOS, routing and > other > beyond-my-control Internet problems. Again, I'm happy to be corrected > if there's something here I'm not aware of. Well, that does tend to rule out a bunch of issues. Have you tried changing the MTU of the FreeBSD box down to 1400 or so (or even 512), just to see whether that does anything? > This is just a snippet ... but it looks like an awful lot of > retransmits > and duplicates to me. I hadn't looked at this before, is this > indicative > of any particular problem? You're seeing ~1% or less retransmits, that's pretty normal. -- -Chuck