We recently had some HP DL380 G8 servers delivered and I have installed RHEL 5.6 and 5.8 on them. Both OS use the Tegon3 driver for the BCM 5719 onboard NICs.
Trouble I had was when any command expecting a lot of output ie sysctl -a was run the system hangs up and stops responding to ping for about 5-10 minutes then finally displays the prompt. When attempting to transfer files the system would copy in bytes, not even kilo-byte speeds.
I found that if I disable TSO problem goes away immediately. We have G7 servers also those servers have never had any issue with TSO enabled. They look like they have BCM 5709 Network Cards, but they run the Broadcom Drivers not the Tegon3 driver suite.
When I look on Broadcom's site they list the 2 nics in two different classes:
G8 w/ 5719 NetXtreme I
G7 w/ 5709 NetXtreme II - says to be used as iSCSI HBA
Has anyone had a similar issue, and if so was it resolved by any driver updates, or did you just disable TSO.