Re: Slow PPP/SLIP bug: Found change that caused problem

Linus Torvalds (
Tue, 2 Apr 1996 09:42:28 +0300 (EET DST)

On 1 Apr 1996, Christoph Lameter wrote:
> I think I isolated the problem. Alan changed the ACK handling in 1.3.73. Ever since then
> we have the performance problems because Packets are resent and resent.
> Look at the 1.3.73 patch at the changes in linux/net/ipv4. Sadly I dont have the
> knowlege to fix it.

Don't blame Alan, it was probably me. I've been working on TCP issues,
but I have only fast interfaces to play with (loopback and normal
ethenet, soon fast ethernet). Those two are faster these days, but it
could have impacted slow interfaces negatively (I don't see how, right
now, but I might be missing something).

How isolated have you gotten it? Can you check if it's the tcp.c or
tcp_input.c changes? (if it's the retransmit changes, _then_ you can
blame Alan ;-)