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SubjectRe: 100Mbps TCP stalls in 2.1.115
On Sun, 9 Aug 1998, Rik van Riel wrote:

> On Sun, 9 Aug 1998, Andi Kleen wrote:
> > On Sun, Aug 09, 1998 at 02:36:49AM +0200, Zlatko Calusic wrote:
> > >
> > > I noticed that stalls are periodical, with period of about 2-3
> > > minutes.
> > >
> > > I made a long ping session, and came up with this:
>
> [SNIP]
>
> > If ping is slow too it is probably a network driver problem,
> > not a TCP problem.
>
> I've been experiencing this problem with PPP too. If it
> occurs on any more network drivers, I'd suspect some
> upper layer instead...
>
> Rik.

Well finally others are having the same kind of stalls that I have
been having since about linux-2.1.70-80. These 20-30 second stalls
make editing over a PPP link pretty difficult.

I think the stalls occur when a link error causes a single ACK to
be lost. The recovery takes a long time, i.e., the length of
time for a window-probe to be sent. Maybe this observation will
point to something.

My work-around, is to run my 56k link at 38k, disable VJ, and
re-dial if it gets too bad.


Cheers,
Dick Johnson
***** FILE SYSTEM WAS MODIFIED *****
Penguin : Linux version 2.1.113 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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