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To: Garrett Wollman <wollman@lcs.mit.edu>
cc: Eka Kelana <eka@werty.wasantara.net.id>, freebsd-hackers@FreeBSD.ORG,
        freebsd-bugs@FreeBSD.ORG, dg@root.com
Subject: Re: Need quick answer 
In-reply-to: Your message of "Fri, 07 Feb 1997 07:29:24 EST."
             <9702071229.AA18092@halloran-eldar.lcs.mit.edu> 
Date: Sun, 09 Feb 1997 16:48:54 +0900
From: Kenjiro Cho <kjc@csl.sony.co.jp>
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<<On Fri, 7 Feb 1997 05:28:25 +0700, Eka Kelana <eka@werty.wasantara.net.id> said:
> I need a good explanation about this code in in_rmx.c:
> ...
> if (!rt->rt_rmx.rmx_sendpipe && !(rt->rt_rmx.rmx_locks & RTV_SPIPE))
rt-> rt_rmx.rmx_sendpipe = tcp_sendspace;
> if (!rt->rt_rmx.rmx_recvpipe && !(rt->rt_rmx.rmx_locks & RTV_RPIPE))
rt-> rt_rmx.rmx_recvpipe = tcp_recvspace;
> ...

>>>>> On Fri, 7 Feb 1997 07:29:24 -0500, Garrett Wollman <wollman@lcs.mit.edu> said:
>> The reason why that is there is because otherwise tcp_close() won't
>> save the ssthresh.

If this is the only reason to set the pipe sizes, I would suggest to
make modifications to
      -	tcp_close to update ssthresh even when the pipe sizes are not
	specified.
      -	in_addroute to leave the pipe sizes unspecified.

Then, ssthresh can be updated in the same manner, but no side-effect.

IMO, if the pipe size is ever set automatically, it should reflect the 
measured throughput * RTT.

--kj

---
Kenjiro Cho
Sony Computer Science Laboratory Inc.