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Date: Tue, 25 Sep 2001 18:41:35 +0900
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To: silby@silby.com, tsuchiya@flab.fujitsu.co.jp
Subject: Re: TCP performance question
Cc: net@FreeBSD.org
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>	>	>
>	>	> I tried to say that it had no effect between FreeBSD4.3 and Solaris, on my
>	>	> problem. That's what I did previously.
>	>	>
>	>	> I found discussion on "delayed ack problem"(January 24 and 25) in this
>	>	> mailing list.  Though still do not understand why delayed_ack=0 does not
>	>	> work for FreeBSD and Solaris.
>	>	>
>	>	> Anyway I appreciate your helping me.
>	>	> Thank you,
>	>	> Yoshi
>	>
>	>	If you can reproduce the problem, please take some traces with tcpdump and
>	>	post them somewhere for public consumption.  Perhaps then the problem can
>	>	be found and fixed.
>	>
>	>	Mike "Silby" Silbersack
>
>
>	Ok, "yokan" is FreeBSD4.1.1 and I set delayed_ack=0, and "purcell" is 
>	a Solaris 2.7 box. The sending size at first is 1460+588byte and 1460+589byte
>	later. When the size gets more than 1460+589bytes, the performance goes down.
>	At that time, purcell begins to send acks, possibly because yokan behaves 
>	very slow.
>

I installed FreeBSD4.4 on this machine(yokan), and tested TCP with Solaris.
Sadly, the result is as bad as it was; same thing happened. 

Yoshi

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