Date: 18 Mar 2002 17:35:44 -0600 From: Aaron Baugher <abaugher@esc.pike.il.us> To: freebsd-stable@FreeBSD.ORG Subject: Network stalls with 4.5 Message-ID: <m2vgbtmotr.fsf_-_@haruchai.esc.pike.il.us> In-Reply-To: <20020317084212.A20201@shell.wetworks.org>
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To follow up on my post of a couple weeks ago: The situation: On upgrading several machines to 4.5-RC (Jan. 25), a couple of clients started noticing stalls when connecting to these machines, both with ssh and pop3. Most of the machines use Intel NICs (fxp) for their gateway connection, but at least one has a 3COM card (xl). The clients having trouble use DSL and cable modems, and I was having no trouble over my analog modem. Most people seem to be connecting to the systems fine (they're primarily web/email servers), so it's not a problem for everyone, or at least for every connection. Upgrading to 4.5-STABLE made no difference. Someone here suggested looking at MTU path discovery. While I didn't see anything indicating a problem with that in a tcpdump, I tried lowering MTU on the NIC to 1400. Still no luck. Also, by now I've had a couple stalls myself, over modem, although not nearly as often as the guys with faster connections. It'll just stall in the middle of typing a command through ssh, and sometimes not go on for minutes. I've found talk of similar symptoms in various places, so I've tried some tweaks people mentioned with sysctl: net.inet.tcp.syncookies: 0 net.inet.tcp.rfc1323: 0 net.inet.tcp.sendspace: 32768 net.inet.tcp.recvspace: 32768 So now I'm waiting to hear if those help. Any other ideas, or things I should report here to help track this down? Thanks, Aaron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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