Date: Sat, 17 Jul 1999 17:44:33 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Vincent Poy <vince@venus.GAIANET.NET> Cc: sthaug@nethelp.no, tim@storm.digital-rain.com, freebsd-hackers@FreeBSD.ORG Subject: Re: poor ethernet performance? Message-ID: <199907180044.RAA86301@apollo.backplane.com> References: <Pine.BSF.4.05.9907171638260.331-100000@venus.GAIANET.NET>
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:> 2.6 MB/sec is what I would expect if you were running the test
:> over an ssh link on a fast cpu - the encryption eats a lot of cpu. But
:> a normal rcp or ftp or data transfer can easily do 9-10 MBytes/sec.
:
: That was actually done with ftp between two machines connected
:Full Duplex to a Cisco Catalyst 2924XL switch.
:Vince - vince@MCESTATE.COM - vince@GAIANET.NET ________ __ ____
You've got breakage somewhere, I've run 9-10 MBytes/sec in both
directions at once through a catalyst between two FreeBSD boxes at
full-duplex.
Check for interface errors or collisions - this kinda sounds like the
duplex hasn't been matched up. You should have no errors and no
collisions at all if you are running full-duplex. Make sure the duplex
and port speed on the catalyst is hardwired -- we have had no end of
troubles with the autodetect junk on catalysts. It also doesn't hurt to
hardware the duplex and port speed on the UNIX boxes.
If you still have problems there are a number of possibilities. If you
are using discrete RJ45 ports try switching the cables as well as use
a different catalyst port. If you are using telco cables - those big
fat 50 or 100 pair cables that use centronics-like connectors on the
catalyst side hat, you probably have an RJ45 punchdown block on the other
end. These have to be Cat-5 punchdown blocks, not Cat-3 punchdown blocks.
Try a different port on the punchdown block.
-Matt
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