Date: Wed, 9 Jun 1999 16:49:18 -0700 (PDT) From: Bill <bill@wagill.com> To: Steve Madsen <steve@dvart.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Poor TCP performance between 2.2.5 and 2.2.8 Message-ID: <Pine.BSF.3.96.990609164029.13334A-100000@duchess.wagill.com> In-Reply-To: <4.1.19990609162912.00ac2dd0@mailhost>
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I continually experience poor TCP performance when sending large files from my FreeBSD 2.2.5 box (Linksys ISA NIC) to my Windows 95 box (Linksys PCI NIC). I have an Ethernet hub and I can see the "Collision" light illuminate nearly steadily ON when transfering a large file from the FreeBSD box to the Windows box (but not the other way around). I did post a PR a couple of FreeBSD versions ago, when I first noticed the problem, and got one of those blanket "must be your hardware" answers. Since the poor performance is not a big deal in my environment, I have not pursued a resolution more insistently. But, most definitely, since about FreeBSD 2.2.3 (give or take a few) I have observed this poor TCP performance along with the high volume of network collisions when transfering large files out of the FreeBSD box. This problem was not evident in the early 2.x releases. For whatever it's worth. - Bill. On Wed, 9 Jun 1999, Steve Madsen wrote: > I realize this may be not very important since work is mostly being done on > 3.x and 4.x these days, but I observed some really poor TCP performance > between a 2.2.5 box and a 2.2.8 box the other day. I was using scp to copy > a large files (80-some MB) from the 2.2.5 box to the 2.2.8 box. Not only > was performance bad, but the 2.2.5 box actually had trouble servicing X > sessions to other people. Their X sessions timed out and went away. Other > than this transfer, the LAN was lightly loaded. > > I'd have to go back and try this again to get solid data, but I was curious > if anyone had seen something like this in the past. I searched the mailing > list archives and didn't find anything related. > > The 2.2.5 box has a 3Com EtherLink III and the 2.2.8 box has a 3Com 3c905 IIRC. > > Using a Linux machine as a middleman worked around the problem; the 2.2.5 > box had no problem sending a huge file to the Linux machine and the 2.2.8 > box had no problems receiving the same large file from the Linux box. The > problem was limited to the two machines talking to each other. > > -- > Steve Madsen <steve@dvart.com> > Digital Video Art, Inc. > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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