From owner-freebsd-hackers  Sun Apr 14 16:25:33 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id QAA21569
          for hackers-outgoing; Sun, 14 Apr 1996 16:25:33 -0700 (PDT)
Received: from zen.nash.org (nash.pr.mcs.net [204.95.47.72])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id QAA21564
          Sun, 14 Apr 1996 16:25:28 -0700 (PDT)
Received: (from alex@localhost) by zen.nash.org (8.6.12/8.6.12) id SAA04908; Sun, 14 Apr 1996 18:25:45 -0500
Date: Sun, 14 Apr 1996 18:25:45 -0500
Message-Id: <199604142325.SAA04908@zen.nash.org>
From: Alex Nash <alex@zen.nash.org>
To: gpalmer@FreeBSD.ORG
CC: hackers@FreeBSD.ORG
Subject: Re: Unices are created equal, but...
Reply-to: nash@mcs.com
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> >   FreeBSD on UFS:
> >           2770803 bytes/second for writing the file
> >           3908495 bytes/second for reading the file
> > 
> >   Linux on ext2fs:
> >           3220442 bytes/second for writing the file
> >           1950476 bytes/second for reading the file
> 
>             ^^^^^^^
> 
> Is that 2nd figure for reading the file right? Seems a bit dubious
> ... unless they're really doing something screwey, you should get
> higher speeds READING than writing ...

It's correct.  In fact, I just tried it 5 more times to be sure:

   1907889 bytes/second
   1899594 bytes/second
   1900282 bytes/second
   1873795 bytes/second
   1898218 bytes/second

The write speed hovered around 3.2MB/s as before.

I admit it's strange, but I also saw this on a P100 with an Adaptec
2940.  The reads would be (somewhere in the neighborhood of) 800K/s
slower than the writes.  After installing FreeBSD on that system,
the reads and writes fell within 100K/s of each other.

Alex