Date: Tue, 20 Jan 2004 15:52:27 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Andre Oppermann <andre@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: tcp mss MCLBYTES restriction Message-ID: <16397.38155.418523.634400@grasshopper.cs.duke.edu> In-Reply-To: <400D9271.1259CBC8@freebsd.org> References: <16397.36782.415899.626311@grasshopper.cs.duke.edu> <400D9271.1259CBC8@freebsd.org>
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Andre Oppermann writes: > When I was implementing the tcp_hostcache I reorganized/redid the > tcp_mss() function and wondered about that too. I don't know if > this rounding to MCLBYTES is still the right thing to do. I have the feeling its something from ancient days on vaxes. ;) > > Would it be OK if I made this code optional via a sysctl? > > Could you run some bechmarks with the current MCLBYTES rounding > and without it on 100Mbit 1.5kMTU and GigE with 9k MTU? 1.5k MTU won't matter -- it doesn't hit the rounding case anyway. But I can certainly run some tests with 9k. Drew
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