[ILUG] download hiccups after 750 KB or so

[Gavin McCullagh]

Hi,

On Thu, 13 Sep 2007, Joerg Baach wrote:

> > Did you apply upgrades in the meantime to say, the kernel?  What kernel are
> > you running?
> 
> Mmmh, as far as I remember the kernel was not updated.

If a major kernel upgrade happened, the old one should still be there.  You
could drop back to the last one with grub and see if that makes any odds.

> joerg at dars:~$ uname -r
> 2.6.21-2-686
> (Debian testing)

And presumably the ubuntu machine is running 2.6.20-16-generic?  You see
the issue on ubuntu but not on windows, right?

> I am using a different connection now (different house). The download
> does not fail, but there is still a form of slowdown / short stop every
> 700k - 800k. I also trried the tcp_window_scaling thing, not too much of
> a difference, I am afraid.

So what exactly have you varied?

 - problem affects debian (testing), ubuntu but not windows?
 - problem happens in both houses -- is that the same debian machine? Is it
   the same ISP?  Is the router the same on both places?
 - happens with several download tools.
 - you've used various sites, presumably very different locations?

> There is still pattern being repeated in wireshark, even though it seems
> to be not quite every 700k - 800k, but at more random intervalls.

It might be worth sending the relevant tcpdump output (or wireshark which I
presume is similar).

Gavin