Re: [Bacula-users] LTO-4 Drive issues

[Sven H. <sv...@sv...>]

On 26.05.2010 01:55, skipunk wrote:

> The nic's in the server are Broadcom's netextreme II's. I would
> assume that they would support checksum offload and large tcp packet
> offload, but I really I'm not sure.

They do support all offload options.

But those options don't boost you from 40MByte/s to 100MByte/s, they
help servers which are already very loaded and your local memory and CPU
throughput is limiting you.

If your CPU is mostly idle, then offloading won't buy you much. (At
least with 1GB NICs. With 10GB NICs this is a whole different picture.)

But beware: some Linux versions had problems with offloading, so while
benchmarking your network with netio and iperf it may be worthwhile to
toggle some offloading options to see if you get any changes in
throughput and/or CPU load.

Grüße,
Sven.