FC2 - Strange Ethernet Behavior

[John Krische]

Thanks for the suggestions, John M.  I've looked in /var/log/messages, 
nothing of any consequence there as I can see.  I'll look again, though, 
maybe I missed something.

As for tethereal - heh, been staring at such output all day for a couple 
days now, almost.  When under normal load levels for the machine I'm 
testing with, packet traffic flies on by at a good clip and is all SHORT 
bursts - dns lookups, broadcasts by Win hosts for browse masters, etc. 
All that short burst traffic works just fine. Then I start a sustained 
load, like a LAN file copy or a big mysql pull or something, and the 
tethereal output starts out normally, but then just slows down after 1MB 
of sustained traffic - kinda weird to see it happen like that.  I can't 
quite tell from looking at it who's waiting for what.  There's no 
obvious packet errors or dropping or anything like that which i can see. 
  But, I'll snip a clip from the output at the moment of slowdown & post 
it here.  Maybe y'all can see something I wouldn't - in a bit over my 
head when we start talking the inner workings of packets... still learning.

John K.



John Meagher wrote:

> You seem to have been pretty methodical about this.  You didn't mention 
> anything about messages in /var/log/messages, though.  Often there's a 
> clue there, if syslog.conf is set up to allow it.
> Maybe if you ran ethereal or tethereal on the machine while it's being 
> slow you could learn which end is  waiting for what.
> 

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