Alexey Kuznetsov wrote:
Hello!
Some people reported that this program runs in 9.997 sec when run on
FreeBSD.
Try enclosed patch. I have no idea why 9.997 sec is so magic, but I
get exactly this number on my notebook. :-)
Alexey
=================
This patch enables sending ACKs each 2d received segment.
It does not affect either mss-sized connections (obviously) or connections
controlled by Nagle (because there is only one small segment in flight).
The idea is to record the fact that a small segment arrives
on a connection, where one small segment has already been received
and still not-ACKed. In this case ACK is forced after tcp_recvmsg()
drains receive buffer.
In other words, it is a "soft" each-2d-segment ACK, which is enough
to preserve ACK clock even when ABC is enabled.
Is this really necessary? I thought that the problems with ABC were in
trying to apply byte-based heuristics from the RFC(s) to a
packet-oritented cwnd in the stack?
rick jones
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