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Re: [RFT] BIC TCP delayed ack compensation

To: Stephen Hemminger <shemminger@xxxxxxxx>, "Injong Rhee" <rhee@xxxxxxxxxxxx>
Subject: Re: [RFT] BIC TCP delayed ack compensation
From: Hubert Tonneau <hubert.tonneau@xxxxxxxxxxxxxx>
Date: Wed, 23 Feb 2005 21:54:47 GMT
Cc: "'cliff white'" <cliffw@xxxxxxxx>, "'Alexey Kuznetsov'" <kuznet@xxxxxxxxxxxxx>, <netdev@xxxxxxxxxxx>, "'David S. Miller'" <davem@xxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
Stephen Hemminger wrote:
>
> An interesting test would be to repeat the slow case: 2.6.10-ac11 over 100Mbps
> 
> With first TCP Reno (old default).
>       sysctl -w net.ipv4.tcp_bic=0

No change.

> then TCP Westwood.
>       sysctl -w net.ipv4.tcp_bic=0
>       sysctl -w net.ipv4.tcp_westwood=1

No change.

Now Linux 2.6.11-rc4 with Injong Rhee abc patch:

No change.

Looks like David S. Miller is right.
Now, what I still don't understand is, if it's PSH/ACK related, why does
the gigabit connected Mac works nicely whereas the 100 Mbps connected one
does not ?


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