Date: Mon, 31 Dec 2001 11:40:00 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Terry Lambert <tlambert2@mindspring.com>, Mike Silbersack <silby@silby.com>, Josef Karthauser <joe@tao.org.uk>, Tomas Svensson <tsn@gbdev.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: FreeBSD performing worse than Linux? Message-ID: <Pine.BSF.4.21.0112311139180.9721-100000@InterJet.elischer.org> In-Reply-To: <200112311927.fBVJR0K21683@apollo.backplane.com>
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the driver should return ENOBUFS and TCP should repect that.. I think it already does in fact.. On Mon, 31 Dec 2001, Matthew Dillon wrote: > :I'm talking about capping the maximum negotiable window size > :over the USB adapter... > : > :How can this cause problems, since (1) the only thing we are talking > :about is window size, not packet size (MTU), and (2) the only thing > :it will effect is the TCP stream post negotiation, so it should not > :result in a slowdown for any virtual circuit other than those that > :*NEED* a slowdown? > : > :-- Terry > > If you look at the tcp dump Josef sent, the server was sending 32-byte > (data) packets over TCP. It only took 8 packets or so to blow up the USB > adapter. 8x32 = 256 bytes. So unless you intend to cap the window size > at, say, 128 bytes, this will solve the ssh issue but destroy performance > for everything else going over the USB ethernet. > > -Matt > Matthew Dillon > <dillon@backplane.com> > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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