Date: Tue, 29 Jun 2004 16:01:10 -0400 From: Charles Swiger <cswiger@mac.com> To: Bill Moran <wmoran@potentialtech.com> Cc: questions@freebsd.org Subject: Re: REPOST: Performance problems with FTP Message-ID: <1133CD52-CA07-11D8-99F8-003065ABFD92@mac.com> 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>
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On Jun 29, 2004, at 3:38 PM, Bill Moran wrote: > Charles Swiger <cswiger@mac.com> 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
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