Date: Tue, 10 Jan 95 23:02:02 +0100 From: jmz@cabri.obs-besancon.fr (Jean-Marc Zucconi) To: lsys@np.ac.sg Cc: hackers@FreeBSD.org, lsys@np.ac.sg Subject: Re: Filesystem(?) preformance - 1.x and 2.0 Message-ID: <9501102202.AA02283@cabri.obs-besancon.fr> In-Reply-To: <199501101201.EAA10332@freefall.cdrom.com> (message from SysAdmin - Ng Pheng Siong on Tue, 10 Jan 1995 19:58:21 %2B0800 (SST))
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>>>>> "SysAdmin" == SysAdmin <- Ng Pheng Siong <lsys@np.ac.sg>> writes:
> Hi. Didn't see any response to a previous post, so I'll try
> again. Hopefully someone can clue me in.
> I have 1.x unpatched-final-current and 2.0R (2.1.0 kernel supped on
> 4th/5th Dec) running on identical hardware alongside each other.
> Somehow, the 2.0 system feels slower. Iozone reports thusly:
> == 2.0 == Writing the 10 Megabyte file, 'iozone.tmp'...27.835938
> seconds Reading the file...20.015625 seconds
> IOZONE performance measurements: 376698 bytes/second for writing
> the file 523878 bytes/second for reading the file
> == 1.x == Writing the 10 Megabyte file, 'iozone.tmp'...25.150000
> seconds Reading the file...43.716667 seconds
> IOZONE performance measurements: 416928 bytes/second for writing
> the file 239857 bytes/second for reading the file
I also noticed a slowdown of the fs with 2.0, and discovered that I
left the BOUNCE_BUFFERS option in my config file. Removing this option
improve the performance a bit (I don't need it since I only have 16Mb):
FreeBSD 2/option BOUNCE_BUFFERS 735K/s write 1120K/s read
FreeBSD 2/no bounce buffers 1151 1434
FreeBSD 1.1.5/no bounce buffers 1630 872
Jean-Marc.
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Jean-Marc Zucconi | jmz@cabri.obs-besancon.fr
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