Re: Router speeds...

[Chris Buechler <funsec () chrisbuechler com>]

Valdis.Kletnieks () vt edu wrote:

> On Sat, 26 Nov 2005 01:22:26 EST, Chris Buechler said:
>
>  
>
> > Since wired is slow as well, I would guess it's the number one problem 
> > you typically run into with wired performance issues - a duplex 
> > mismatch.
> >    
>
> Hmm.. I'm not sure. Usually, those manifest as *really* bad throughput
> (100mbit pipe, and 40-50kb/sec - those TCP retransmits *really* kill you).
>
>  

nah, you can easily get 1 Mb through a 100 Mb connection with a duplex 
mismatch, and probably 1 Mb through a 10 Mb duplex mismatch.  I've seen 
too many networks setup by well-intentioned but clueless people, where 
they start forcing speed and duplex all over the place (it's a 
performance tweak!! </sarcasm>  I won't get on my soap box :) but only 
on one side or the other, and end up with bunches of mismatches.  I've 
seen a file server in a situation where duplex was mismatched at 100 Mb, 
and performance got horrible once it got up to about 10 Mb throughput 
(it had been operating for a couple years that way without anyone 
complaining until the load increased). 

-Chris
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