Interesting enough, I started having this same ages-old problem after a recent upgrade to 2.6.28-16-server kernel. The system performed without a single issue for three months before that, including under very heavy load. It runs Ubuntu Server 9.04 on dual-CPU Supermicro motherboard with Quad-Core AMD Opterons 2389 installed.
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.04
Release: 9.04
Codename: jaunty
# uname -a
Linux hostname 2.6.28-16-server #55-Ubuntu SMP Tue Oct 20 20:37:10 UTC 2009 x86_64 GNU/Linux
Interesting enough, I started having this same ages-old problem after a recent upgrade to 2.6.28-16-server kernel. The system performed without a single issue for three months before that, including under very heavy load. It runs Ubuntu Server 9.04 on dual-CPU Supermicro motherboard with Quad-Core AMD Opterons 2389 installed.
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.04
Release: 9.04
Codename: jaunty
# uname -a
Linux hostname 2.6.28-16-server #55-Ubuntu SMP Tue Oct 20 20:37:10 UTC 2009 x86_64 GNU/Linux
# lspci|fgrep Ethernet
00:08.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a3)
00:09.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a3)