Date: Sun, 22 Dec 2002 13:06:18 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "matthew c. mead" <mmead@goof.com> Cc: Robert Watson <rwatson@FreeBSD.ORG>, freebsd-net@FreeBSD.ORG Subject: Re: TCP interactions (was: Re: Linux and FreeBSD poor network performance) Message-ID: <200212222106.gBML6INI032302@apollo.backplane.com> References: <20021221165745.A67089@goof.com> <Pine.NEB.3.96L.1021222105809.91887B-100000@fledge.watson.org> <20021222151259.A21189@goof.com>
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By your description, it is almost certainly a packet loss problem...
a cabling issue or a switch issue most likely. Try doing large
pings, like this, and see if you get hicups:
bsdbox# ping -i 0.1 -s 3000 linuxbox
-Matt
Matthew Dillon
<dillon@backplane.com>
:
:On Sun, Dec 22, 2002 at 10:59:52AM -0500, Robert Watson wrote:
:> On Sat, 21 Dec 2002, matthew c. mead wrote:
:
:> > I have a Linux box and FreeBSD box sitting on a 100Mbit ethernet segment
:> > that cannot seem to talk to one another faster than 150K/s. I've been
:> > using scp, ftp, http, to test this.
:
:> And you've done tests in both directions, or just in one?
:
:Both.
:
:> Could you try using a non-TCP performance measurement tool of some sort?
:> I.e., some sort of UDP throughput test. Because of your comment about the
:> two boxes talking to windows fine, it sounds likely to be a TCP
:> interaction, but it would be useful to check and see.
:
:I didn't get around to it before I started looking at
:hardware/driver. I dropped a 3c905 into the Linux box and things
:improved. I grabbed a new ethernet card elsewhere today and it
:works just fine.
:
:> I've CC'd Matt Dillon because he's fixed a number of subtle TCP bugs of
:> this sort in the past and can probably provide some debugging guidance.
:
:I think it's the Linux driver. Sorry for the false alert. This would
:be a fun one to figure out if it were tcp stack interactions. :(
:
:
:-matt
:
:--
:matthew c. mead
:
:http://www.goof.com/~mmead/
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