Date: Thu, 10 Jun 1999 17:29:57 +0900 From: Changhoon Kim <kimch@etri.re.kr> 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: <375F7785.4CE97576@etri.re.kr> References: <4.1.19990609162912.00ac2dd0@mailhost>
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Though this mail seems not to help Steve, I've experienced similar situations before. And I've already consulted this situation to this mailing list. I used two FreeBSD 3.1 machines(with SMC EZ Fast-Ethernet NIC) and one Redhat Linux 6.0 machine(with the same NIC). These three machines were attached to a fast-ethernet segment. Under this configuration, when I transmitted files from either of the FreeBSD box to the Linux box, transmission speed was over than 70Mbps. However, when it came to the transmission between the two FreeBSD boxes, I did not observed transmission speed surpassing 50Kbps ! I've tried to solve this problem for about two weeks but in vain. Currently, I've upgraded both FreeBSD machines into 3.2-Release and the awful transmission performance problem has been completely vanished ! But, I'm still in curiosity. Any good ideas, suggestions or comments ? Thanks folks. 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 -- ========================================================== Changhoon Kim Internet Technology Research Dept. Switching & Transmission Technology Lab. Electronics and Telecommunications Research Institute(ETRI) 161 Kajong-dong, Yusong-gu, Taejon, 305-350, KOREA Tel: (Office) +82-42-860-5801, (Cell) +82-19-226-6305 E-mail: kimch@etri.re.kr * All Smiles, Everywhere and Everytime ! =========================================================== To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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