Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site umcp-cs.UUCP
Path: utzoo!linus!philabs!cmcl2!seismo!umcp-cs!chris
From: chris@umcp-cs.UUCP (Chris Torek)
Newsgroups: net.unix-wizards
Subject: Re: larger buffer -> slower net transfer?
Message-ID: <1774@umcp-cs.UUCP>
Date: Tue, 8-Oct-85 02:20:45 EDT
Article-I.D.: umcp-cs.1774
Posted: Tue Oct  8 02:20:45 1985
Date-Received: Thu, 10-Oct-85 06:00:49 EDT
References: <1929@brl-tgr.ARPA>
Organization: U of Maryland, Computer Science Dept., College Park, MD
Lines: 14

The answer probably lies in such unappealing low-level things like
data alignment and room temperatature :-).  In particular you need
to find out just what is being copyout()ed and whether mbufs or
mclusters are being used.

I just started to annotate sosend(), but it is far too large for
posting here, I deem.  So all I will say is look at the send high
water mark and see when you will run into it (probably at 2K data);
and check all your interface code for when it uses mclusters, and
for when it `copies' by remapping and when it truly copies.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251)
UUCP:	seismo!umcp-cs!chris
CSNet:	chris@umcp-cs		ARPA:	chris@mimsy.umd.edu