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Date:      Tue, 30 Jun 1998 09:53:10 -0400 (EDT)
From:      Yee Man Chan <ymc@umich.edu>
To:        ben@rosengart.com
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: client-server problem  
Message-ID:  <Pine.SOL.3.95.980630094229.25415B-100000@qbert.rs.itd.umich.edu>
In-Reply-To: <Pine.GSO.3.96.980630015211.7127A-100000@echonyc.com>

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On Tue, 30 Jun 1998, Snob Art Genre wrote:

> On Mon, 29 Jun 1998, Yee Man Chan wrote:
> 
> > Here is how the program performs under FreeBSD 3.0-CURRENT with different
> > n: 
> > 1-100 Very fast
> > 101-207 Very Slow (This range is the strangest I've ever seen)
> > 208-1024 Very fast (just like 1-100)
> > >1024 strange errors like unknown host or connection timedout
> > 
> > Any clue?
> 
> I don't know about your >1024 problems, but the rest is explainable.  It
> has to do with the way memory is allocated in the kernel for network
> i/o.  I don't remember the exact details, but it's all put forth quite
> clearly in W. Richard Stevens' _TCP/IP Illustrated Vol. 3_, with graphs
> and everything.
> 
> Are you using TCP or UDP?  What kind of link are you going over?  

Thanks for your response. I will consult Stevens' book.

I am using TCP. I don't think anything is going over a link. The program
assumes localhost communication, so nothing should be go over a link.

I run the program in SunOS but unlike FreeBSD, 101<=n<=207 is just as fast
as <100 and >207 <1025. Why? Is it because SunOS and FreeBSD have
different memory allocated in the kernel for network i/o?

Yee Man

P.S. Did I send the email attached with my server-client code? You should
be able to get it and show me where my bugs are. If there is no files
being attached, tell me and I will put the source code in the email.

> 
> 
> 
>  Ben
> 
> "You have your mind on computers, it seems." 
> 


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