the distro kunundrum...

[me-5yx05kfkO/aqeI1yJSURBw at public.gmane.org (Matthew Gillen)]

On 11/16/2009 01:34 PM, Richard Pieri wrote:
> On Nov 16, 2009, at 1:27 PM, Stephen Adler wrote:
>> The rates that I'm getting are 7MBytes/sec into the system, 15MBytes/sec 
>> out of the system when running RHEL 5.4.
> 
> Yeah... check your speed and duplex settings.  On both sides.  Disable auto-negotiate.

Sometimes your switch or router can get confused with the auto-negotiate, so
yeah, turn that off to eliminate one major source of degraded TCP
performance (when CISCO stuff gets confused, it defaults to
10Mbit/half-duplex, which is freaking horrible for TCP).

Matt