[Linux-aus] strange LAN congestion problem

[Nick Edwards]

Thanks Kevin,
Will give that a go when it next happens, amazing how such junk can
bring such a powerful capable network to its knees, guess you do get
what you pay for.

I am trying some different sysctl values that was suggested, has to be
cheaper than getting a cisco switch heh, or altering the links and
putting the big files on dropbox or some such thing.


On 6/16/14, Kevin Maciunas <kevin at cs.adelaide.edu.au> wrote:
> I've seen this sort of behavior caused by lack of buffer depth on the
> switch.  As a recycled network person, my first reaction would be to
> dust off wireshark and observe the behavior on the ethernet.
>
> The setup I've played with that exhibited this in spades was a netgear 5
> port switch.  This linked some scientific instrumentation that was
> almost sync'd - and would send a burst of data every 1 second.  The
> chaos that ensued brought the Gbit network to its knees.  I suspect in
> the consumer grade switch side of the kit you're using, the buffering on
> the links is very minimal and this is causing the train wreck upstream.
> (The usual fall back to slow start etc etc...)  Wireshark is probably
> your friend in this case.
>
> My $0.02.
> /Kevin
>
> --
> Kevin J. Maciunas              Net: kevin at cs.adelaide.edu.au
> Dept. of Computer Science      Ph : +61 8 8313 5845
> University of Adelaide         Fax: +61 8 8313 4366
> Adelaide 5005 SOUTH AUSTRALIA  Web: http://www.cs.adelaide.edu.au/~kevin
> Fingerprint = 7E5A A0C2 22BC 5993 17F2 93CE B1FD DEC6 D0C0 50CD
>
>
> _______________________________________________
> linux-aus mailing list
> linux-aus at lists.linux.org.au
> http://lists.linux.org.au/listinfo/linux-aus
>