On Sat, Feb 06, 2010 at 01:16:00PM +0100, Peter Griffin wrote: > Both http & https. Also both web servers started to take it in turns to > report as DOWN but more frequently the second one than the first. > > I ran ethtool eth0 and can verify that it's full-duplex 1Gbps:
OK. > I'm attaching dmesg, I don't understand most of it. well, it shows some video driver issues, which are unrelated (did you start a graphics environment on your LB ?). It seems it's reserving some memory (64 or 512MB, I don't understand well) for the video. I hope it's not a card with shared memory, as the higher the resolution, the lower the remaining memory bandwidth for normal work. But I don't see any iptables related issue there, so that's fine. Stupid question, are you sure that your traffic passes via eth0 (the gig one) ? I'm asking, because eth1 is a cheap 100 Mbps realtek 8139, and if you got the routing wrong, it could explain a lot of networking issues ! > I'll try to send a file > in both directions to saturate the link as you suggested. OK. When doing that, don't bench the disks, just the network. For that, create "sparse files", which are empty files for which the kernel produces zeroes on the fly, and send them files to /dev/null. Eg with ftp : machine1$ dd if=/dev/null bs=1M count=0 seek=1024 of=1g.bin machine2$ ftp machine1 > recv 1g.bin /dev/null Regards, Willy
