Date: Sun, 27 Aug 2000 20:03:55 -0400 (EDT) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Ping Yuan <yuanpinghh@yahoo.com> Cc: freebsd-net@FreeBSD.ORG Subject: Setting buffer size. Message-ID: <200008280003.UAA21054@khavrinen.lcs.mit.edu> In-Reply-To: <20000827174129.15742.qmail@web1607.mail.yahoo.com> References: <20000827174129.15742.qmail@web1607.mail.yahoo.com>
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<<On Sun, 27 Aug 2000 10:41:29 -0700 (PDT), Ping Yuan <yuanpinghh@yahoo.com> said: > I am now using Freebsd 3.2 as a router. I noticed that > when the router was busy, more packets would be > dropped. This is a fundamental limitation of BSD's network stack and two-level interrupt scheme. More memory will not help; when packets are being dropped, the kernel is already receiving more packets per unit time than it is capable of forwarding. See, for exampl, Jeff Mogul's ``Receive Livelock'' paper. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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