On Wed, Jul 28, 2004 at 12:36:11PM -0400, Scot L. Harris wrote: > On Wed, 2004-07-28 at 11:38, Christopher A. Smith wrote: > > I recently installed FC1 (still a little wary of FC2) on a workstation and > > a laptop. Both had previously been running RH 9; FC1 was installed by > > paving the hard drive and installing from scratch. Immediately after the > > upgrade, I noticed a surge in Ethernet collisions and a corresponding > > decline in network throughput and usability on both systems. Anything > > that involves reading or writing more than 64k or so -- e.g., NFS work, > > web browsing, Fedora updates -- results in collisions, and network > > activity comes to a screeching halt for several seconds. Removing NFS all > > together and working entirely off of local disk makes no difference. > > (Didn't think it would, but it was worth a try.) > > > > > Both systems had been running RH9 with the exact same hardware, and > > collisions were never a problem. The laptop dual-boots Windows XP Pro, > > and its network performance is what I'd expect; there's been no observable > > or quantifiable difference in throughput. > > > > Does anyone have any ideas or suggestions on where I should look? > > Problems with the driver (either) or its configuration? Or is this one of > > those "Upgrade to FC2 and call us back" situations? > > > > Thanks! > > I would start by verifying the duplex settings on the NIC in the FC1 box > and the port on the switch. mii-tool should let you check the setting > and force it. 100Mbp connections should be set to full duplex. > > I have seen some cisco switches that fight with some systems (in my > experience SUN servers had this problem). The auto-negotiate would not > work as expected for some reason. Lock down the speed and duplex > settings on the switch and the NIC to eliminate this as a possible > problem. Yep, that was the problem. The NIC was in half-duplex and is much happier in full-duplex. I didn't even think of that because auto-negotiation has been running fine here for so long. Oh well. Thanks! -------------------------------------- Christopher A. Smith Arlington, VA USA chris@xxxxxxxxxxxxx
