[nzlug] Slow uploads to Trademe

[cr]

On Tue, 08 Aug 2006 12:11, Joel van Velden wrote:
> On Tue, 2006-08-08 at 08:30 +1200, Hadley Rich wrote:
> > On Tuesday 08 August 2006 10:12, cr wrote:
> > > mtu 512 is the answer in my
> > > case).
> >
> > Wow, that's small.
>
> You could take the scientific approach of changing the MTU between 512
> and 1500 (say in increments of 100) and timing how long it takes to send
> an email with an attachment to yourself or something similar.

Yes, that occurred to me, and I will do that.   I can do better than timing it 
though - I can watch the 'outgoing' line on the graph in KPPP - the gaps when 
it 'stalls' show up.

> My guess is you've got a bad phone line and noise on the line is killing
> off packets. the larger your MTU the more data is in a packet and more
> data has to be resent if a packet gets killed.

I have had noise on the line sometimes (like, when you can hear it in your 
telephone, that's line noise!)   But I don't think it's the present reason 
simply because uploads to Trademe via my Sarge setups have consistently 
'choked' for the last two weeks, while uploads to e.g.  Freeshare.us  (a 
picture hosting site) via Clear have worked perfectly, so has ftp, so have 
uploads to Trademe with my old Woody setup or with W98.   (Unless of course 
Woody and W98 default to a small MTU size).

> There's nothing wrong with a small MTU, all it will do is reduce a
> little efficiency when downloading at 56k. It may even increase your
> ping times if you're lucky.
>
> Cheers,
> Joel van Velden

Thanks

cr