Date: Sun, 7 Mar 2004 19:50:44 -0500 From: Don Bowman <don@sandvine.com> To: "'Marc G. Fournier'" <scrappy@hub.org>, Tim Wilde <twilde@dyndns.org> Cc: freebsd-net@freebsd.org Subject: RE: Odd network issue ... *very* slow scp between two servers Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337045D8415@mail.sandvine.com>
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From: Marc G. Fournier [mailto:scrappy@hub.org] > On Sat, 6 Mar 2004, Tim Wilde wrote: > > > On Sat, 6 Mar 2004, Marc G. Fournier wrote: > > > > > I have two servers on the same network switch, sitting > one on top of the > > > other ... one is running an em (Dual-Xeon 2.4Ghz) device, > the other an fxp > > > (Dual-PIII 1.3Ghz) device ... > > > > Is it a Cisco Catalyst switch? If so, you need to switch > the em's to > > autoselect, on both the server and switch end. For some > reason, the em > > driver will not properly lock down its rate when talking to a Cisco > > Catalyst switch. At least, I had an identical problem with > em's talking > > to a Catalyst 2950 and that was the fix I came up with. > Give it a try and > > see how your results go. > > Note that forcing it to 100baseT half-duplex (or 10baseT/UTP > half-duplex) > corrects the problem ... turns out it is only in full-duplex > mode that its > hosed ... Actually, this is normal behaviour according to the 802.3u spec. If a device in 'auto' mode is connected to one that is forced 100FDX, the auto one will negotiate 100HDX. For example, see HP faq: http://www.hp.com/rnd/support/faqs/2700.htm#question6 http://roger.friendex.net/duplex_mismatch.htm has a nice table of this. --don
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