Re: 100Mbps TCP stalls in 2.1.115
Andi Kleen (ak@muc.de)
Mon, 10 Aug 1998 21:03:56 +0200
On Mon, Aug 10, 1998 at 06:11:28PM +0200, Rik van Riel wrote:
> On Mon, 10 Aug 1998, Chris Wedgwood wrote:
>
> > > If ping is slow too it is probably a network driver problem,
> > > not a TCP problem.
> >
> > No, its much stranger. I've had problem since 2.1.9x or before on
> > Intel, but Alpha is fine. I've change NICs, etc. and the Intel box
> > still sucks and the Alpha still works.
> >
> > I only have problems talking to some stacks, fancy stacks like recent
> > '95 stacks and perhaps '98 with have scaling, SACK, etc. perform very
> > well, not to fancy stacks like 2.0.x and NT blow goats.
> >
> > A breif (possible inaccurate summary):
> > 2.1.x Intel <-> Windows95 + IE4.01SP1 - rocks
> > 2.1.x Intel <-> 2.1.x Alpha - sucks
> > 2.1.x Intel <-> Windows NT 4sp3 - sucks
> > 2.1.x Intel <-> 2.0.x Intel - sucks
> > 2.1.x Alpha <-> Anything ? - rocks
>
> Hmm:
> - simple 2.0.x works with other simple stacks, both on 32 and 64 bits
> - complicated 2.1.x works great on a 64 bit arch
> - complicated 2.1.x performance varies greatly on a 32 bit arch
>
> Does this sound like "overflow" to anyone else :-)
Nearly everything in TCP/networking is __u32, so that is pretty unlikely.
For real debugging tcpdumps of slow transfers are needed.
-Andi
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