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Date: Thu, 17 Oct 2002 01:08:34 -0700 (PDT)
From: Oleg Polyakov <opolyakov@yahoo.com>
Subject: Re: delayed ACK
To: freebsd-net@FreeBSD.ORG
In-Reply-To: <3DAC9D37.7060701@expertcity.com>
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--- Steve Francis <steve@expertcity.com> wrote:
> Lars Eggert wrote:
> 
> >Paul Herman wrote:
> >  
> >
> >>Not true.  Although some bugs have been fixed in 4.3, FreeBSD's
> >>delayed ACKs will still degrade your performance dramatically in
> >>some cases.
> >>    
> >>
> >
> >I'm sorry, but such statements without a packet trace that exhibits the 
> >problem are just not useful.
> >
> >Lars
> >  
> >
> He's probably referring to poorly behaved windows clients, on certain 
> applications, if you leave net.inet.tcp.slowstart_flightsize at default.
> 
> Incidentally, why are not the defaults on 
> net.inet.tcp.slowstart_flightsize higher?
> RFC2414 seems to indicate it should be higher. Solaris in version 8 and 
> later default to 4 for this value.

As you may know there is RFC draft which will replace RFC2414
(draft-ietf-tsvwg-initwin-04). 
It also require to decrease cwnd in case we decreasing MSS because of
PMTU Discovery to prevent small packet bursts.

I've got patches, they are pretty trvial - somebody with commit bit has
to take a look and put them in a tree.

----
Oleg


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