[iyonix-support] Re: Abyssmally slow ethernet

  • From: Roger Darlington <rogerarm@xxxxxxxxxx>
  • To: iyonix-support@xxxxxxxxxxxxx
  • Date: Sat, 16 Jun 2007 19:18:33 +0100

On 16 Jun 2007, Mike Sandells wrote:
> 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.)

I have no idea what the NSLU2 expects, but I tried all of the 
settings, 0 10 half and full; plus 0 100 half and full.

On the eklink 0 10 settings, my PAE CE84 Router would not respond, 
preferring instead to make LanMan98 (or something else?) issue 'timed 
out resolving' errors.

On eklink 0 100 settings, it went at 2.8MB/s for the first 22MB to 
35MB transfers, then issued 'connection lost' errors, which seems to 
tie in with your guess that something is expecting something else. 
Trouble is, I tried all settings, so one of those settings MUST have 
been the one it was expecting, mustn't it?? Unless it, contrarily, 
changes it's mind when I guess the right one, and it then decides that 
the right one is the wrong one??


> 
> 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.

Hmmm...??
> 
> 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.

There is a lot of hourglass activity when transfers are going at only 
35KB/s, but nt when they are going 100 times faster at 2.8MB/s, but 
then it eventually loses connection after only 22-53 MB with a 
'connection lost' error.


> 
> It might also be worth setting up a share on the PC, and testing
> performance to and from that.

I have done that.
results were reported here earlier, but I don't know how to quote 
e-mail numbers.

Anyway, it was 100 times faster using a PC share; Iyo > LanMan98 >  
Router > PC > USB2 500GB NTFS drive got 2.8MB/s transfers.

> 
> Mike


-- 

Cheers
Roger

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Oh no! I've only just managed to get it all in of kilter.
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