Date: Fri, 16 Feb 1996 14:03:41 -0500 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Conny Larsson <conny@teligent.se> Cc: questions@freebsd.org Subject: TCP/IP performance - urgent! Message-ID: <9602161903.AA20823@halloran-eldar.lcs.mit.edu> In-Reply-To: <Pine.BSF.3.91.960216194105.9578A-100000@kvaser.teligent.se> References: <Pine.BSF.3.91.960216194105.9578A-100000@kvaser.teligent.se>
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<<On Fri, 16 Feb 1996 20:02:45 +0100 (MET), Conny Larsson <conny@teligent.se> said:
> In short, I get substantial performance degradation using TCP/IP
> stream sockets when the size of the data being sent/received is within
> certain intervals.
You are probably experiencing performance degradation due to
interference between the mbuf and socket buffer layers. In
/sys/kern/uipc_socket2.c, look for the line:
sb->sb_mbmax = min(cc * 2, sb_max);
...and change the `* 2' factor to something more reasonable (like `*
8'). That should (if this is the source of your problem) cause
transfers to run faster, at the expense of more memory usage.
-GAWollman
--
Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ...
wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence. We like people
MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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