(I changed the Subject line because it kept getting rejected due to a "suspicious header" - it was originally "10Mb vs 100Mb") First of all, thanks to all of the following for their input, suggestions and info (I received a ton of responses, so I aplogize if I inadvertently leave someone off): Stuart Whitby, Paul G. Brol, Bernard du Breuil, Johan Hartzenberg, Alan Kong, Dennis Martens, Todd M. Wilkinson, Jason Grove, Derek Olsen, Dave Werth, hmnguyen, Ken Robson, Fran DeMontier, Peter Stokes, Julian Simpson, Matthew Stier, Jesse Carroll, John F. McLaughlin, Richard Bond, Mark Cain, Johan Hartzenberg, Vern Walls, Christer Eriksson, Tony Walsh, Joe Fletcher, Andy Lee, Michael DeSimone, Martin Hepworth, Al Hopper, Steve Holdoway, Meenakshisun Paramasivam, Simon R, Matthew Ryanczak, Kent Perrier, Ray McCaffity, Sean P Burke, Matthew Mauzy, Jim Becher, Dik Casper Short synopsis of problem: network throughput between two locations was running faster and more reliably at 10Mb/sec than 100Mb/sec from a Sun E420R and various Sun workstations (Ultra-1, Ultra-10 & Ultra-60). Between systems in the same building, we were getting ~90Mb/sec throughput, but between buildings ~8Mb/sec. Troubleshooting: The majority of the responses I received strongly recommended that we force both the Sun workstation and the Cisco switch port to 100/fdx. When we tried this, we received even more errors and the same throughput - sometimes even slower. Sun strongly claims that auto-negotiation works (this specific problem between Sun & Cisco was fixed about a year ago). We tried this - didn't work. We tried forcing Sun to 100/fdx and the switch to auto - but the Sun would still drop to 10/hdx. What we found for certain: My network admin monitored the switch port-by-port and we started identifying the systems that were causing the most errors on the switch - and lo-and-behold, we found they were primarily those that were at 10/hdx and 2 of these were early models of Ultra-1's. The port is le0 not hme0 and "le" can not be configured (from what I've read and Sun told me) - they only work at 10/hdx. We moved these 2 systems to the old 3Com switch, hoping to relieve the collisions and errors on the Cisco switch - nada. Final result by working with Cisco: The OS on the switch needed to be patched/updated to fix a known SNMP memory leak, which caused the majority of our buffer overflows - thus causing dropped packets and retrans. By turning off SNMP on the switch (which we don't need anyway) and using the "forced" method, we are now achieving 64Mb/sec throughput between the 2 buildings. Again, thanks to all who replied to my initial cry for help. Ron Dinwiddie UNIX System Administrator Temple Inland Forestry Products Corp. (TIFPC) - Diboll email: rdinwid@templeinland.com Office: 936-829-1592 Fax: 936-829-6666 Pager: 936-630-7086 _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagersReceived on Wed Sep 19 08:15:34 2001
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