Date: Mon, 8 May 1995 10:56:22 -0400 (EDT) From: Arlie Davis <arlie@thepoint.net> To: Robert Withrow <witr@rwwa.com> Cc: freebsd-hackers@FreeBSD.org Subject: Re: Help! My FreeBSD TCP stack is broken? Message-ID: <Pine.3.89.9505081050.A29919-0100000@dg.thepoint.net> In-Reply-To: <199505081433.KAA24568@rwwa.com>
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> I have had similar behavior: ICMP_ECHO indicated low latency, > TCP throughput almost nonexistant. I thought it was caused > by the BPF (because it happened when I compiled in BPF). But > it went away after I rebooted. I'm glad this happened to > you because in confirms my problem. I'm sorry I can't help > though... (BTW, my problems were with 2.0R (with the one > line patch to PPP). My network link was PPP, but since > you had the problem with ethernet, it seems to be somthing > higher up than the IF code... Several people pointed out the source of the problem: RFC1323, which is big TCP window support. Turning this off (via "sysctl -w net.inet.tcp.rfc1323=0") dramatically improves the system's useability. Can someone explain why this happens? Big TCP windows is a Good Thing, but why does it sometimes break? -- arlie
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