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Re: [RFT] BIC TCP delayed ack compensation

To: Stephen Hemminger <shemminger@xxxxxxxx>, cliff white <cliffw@xxxxxxxx>
Subject: Re: [RFT] BIC TCP delayed ack compensation
From: Hubert Tonneau <hubert.tonneau@xxxxxxxxxxxxxx>
Date: Tue, 22 Feb 2005 22:22:42 GMT
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxx, Injong Rhee <rhee@xxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
Stephen Hemminger wrote:
>
> This patch which was extracted from BIC TCP 1.1 compensates
> for systems (like MaxOSX) that don't ACK every other packet.
> It has no impact for normal transfers, but might help with problems
> with Mac like Hubert found.

No, it's even worse.

2.6.9 to 100 Mbps connected MacOSX: 15 seconds (for roughly 100 MB or data)
2.6.9 to gigabit connected MacOSX: 5 seconds
2.6.10-ac11 to 100 Mbps connected MacOSX: 325 seconds
2.6.10-ac11 to gigabit connected MacOSX: 5 seconds
2.6.10-ac11+BIC to 100 Mbps connected MacOSX: 620 seconds
2.6.10-ac11+BIC to gigabit connected MacOSX: 5 seconds

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