Re: Network Performance?

[Andrew Morton]

Tim Sailer wrote:
> 
> On Sat, Jan 06, 2001 at 10:11:40PM +1100, Andrew Morton wrote:
> > this issue was discussed on the netdev mailing list a few weeks
> > back.
> >
> > It's very unfortunate that the web archives of netdev
> > stopped working several months ago and there now appears
> > to be no web archive of [e-mail].
> >
> > Go to http://oss.sgi.com/projects/netdev/archive/ and
> > pull down the November and December archives.
> >
> > The subject was "linux to solaris tcp issues on WAN".
> >
> > The conclusion was "The problem is also fixed with
> > 2.4.0-test12pre3". Dunno about kernel 2.2 though.
> 
> Well, on Friday, we pulled down the 'official' 2.4.0, and had the
> same experience... nothing better. Should I get the -test12-pre3 kernel
> and try that one specifically?

I doubt if that would help.

I claim no expertise in this area, but perhaps we can
get some protocol gurus interested.

To recap:

You're sending and receiving FTP/TCP/IP4 to Solaris and AIX hosts
You have a 1000kbyte window size
You have an 80 megabit/sec pipe.
You're getting 1.8 megabits/sec.

What is the round-trip time on the WAN?

Packet loss?

Does the problem occur in both directions?

Are you _sure_ the window size is being set correctly? How
is it being set?

Are you able to generate TCP dumps when the problem is happening?

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