[iyonix-support] Re: Abyssmally slow ethernet
- From: Mike Sandells <mike@xxxxxxxxxx>
- To: iyonix-support@xxxxxxxxxxxxx
- Date: Sat, 16 Jun 2007 13:48:51 +0100
On 16 Jun, in message <4d55c97b4e36ead3f34e.rogerarm@xxxxxxxxxxxxxxxxxxx>
Roger Darlington <rogerarm@xxxxxxxxxx> wrote:
[snip]
> Abysmally slow, just like mine :-(
Apologies if this has already been covered, but what are the duplex
settings/status of the nslu2 box itself?
If one end of a network conversation thinks duplexing is on, while the
other end thinks it is off, very slow performance is usually the result,
but often much slower in one direction of moving data than the other.
This seems to be the symptom you are seeing.
Similarly, auto-negotiation of duplex tends to only work if both ends
are set to auto-negotiate (and even then can be twitchy). Generally its
best to nail everything in place to 100Mb full duplex, if possible.
(10Mb was originally half-duplex only, 100Mb could be half or full,
while 1Gb networking can only be full duplex. The idea of full duplex
10Mb was added later, so some devices that are 10Mb support it, while
some do not acknowledge that such an option exists. Full duplex, in this
context, just means the ability to talk and listen at the same time. If
one end wrongly expects the other to be able to do this, then it will
cheerfully talk while the other end is talking to it, and anything it
sends while data is coming in is effectively lost. It may then wait for
a reply before timing out and asking again, which might fail again for
the same reasons depending on what else is going on at the time.)
It might also be worthwhile looking at what is actually going on between
the nslu2 and the iyonix using something like WireShark (formerly
Ethereal) on the PC to capture the traffic between the two. That would
tell you whether there are large numbers of requests to re-send lost
data or large delays in response to requests.
i.e. whether the network link is working hard but achieving little, or
whether it is idle for much of the time, with occasional bursts of
activity.
It might also be worth setting up a share on the PC, and testing
performance to and from that.
Mike
--
Mike Sandells
Work: mikejs@xxxxxxxxx http://www.liv.ac.uk/csd
Home: mike@xxxxxxxxxx http://www.mikejs.com/
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