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Re: lmbench with new checksum code...

To: "David S. Miller" <davem@caip.rutgers.edu>
Subject: Re: lmbench with new checksum code...
From: lm@gate1-neteng.engr.sgi.com (Larry McVoy)
Date: Thu, 16 May 1996 09:03:36 -0700
Cc: lmlinux@neteng.engr.sgi.com, torvalds@cs.helsinki.fi, sparclinux-cvs@caipfs.rutgers.edu, alan@cymru.net
Sender: owner-linux@cthulhu.engr.sgi.com
:             *Local* Communication bandwidths in megabytes/second
:             ----------------------------------------------------
: Host                 OS Pipe  TCP  File   Mmap  Bcopy  Bcopy  Mem   Mem
:                                   reread reread (libc) (hand) read write
: --------- ------------- ---- ---- ------ ------ ------ ------ ---- -----
: trombetas  Linux 1.99.3    8  4.8   25.0   17.4     18     24   41    36
: geneva.ru     SunOS 5.5    8  7.0   12.6   19.5     18     18   40    36
: negro.rut SunOS 4.1.3_U    4  2.0   19.5    8.2     18     24   41    36

THis is sorta weird - why is it that mmap reread is slower than file reread?
Do you have a kernel bcopy that is faster than memory read?

I think your 4.8MB/sec number is pretty studly.  That means you are 
checksumming 9MB/sec as well as the protocol stack on a system that 
bcopies at ~20MB/sec.  You're already better than 2x the SunOS code.
Call it a day, you won.

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