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Date:      Fri, 8 Oct 1999 17:29:54 -0400 (EDT)
From:      Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
To:        Mohit Aron <aron@cs.rice.edu>
Cc:        freebsd-net@FreeBSD.ORG
Subject:   sbappend() is not scalable
Message-ID:  <199910082129.RAA67391@khavrinen.lcs.mit.edu>
In-Reply-To: <199910082051.PAA25028@cs.rice.edu>
References:  <199910082051.PAA25028@cs.rice.edu>

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<<On Fri, 8 Oct 1999 15:51:29 -0500 (CDT), Mohit Aron <aron@cs.rice.edu> said:

> can be about 600 mbufs in the socket buffer waiting to be acknowledged. Thus
> upon every ACK, about 600 mbufs are traversed causing the TCP sender to run 
> out of CPU.

This is a well-known feature of the 4BSD socket layer.  The right fix
is to get rid of the socket layer, but this requires a substantial
effort that none of the people who know how to do it have been able to
put in.

-GAWollman

--
Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu  | O Siem / The fires of freedom 
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick


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