From owner-freebsd-hackers Tue Jan 10 14:06:15 1995 Return-Path: hackers-owner Received: (from root@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id OAA05286 for hackers-outgoing; Tue, 10 Jan 1995 14:06:15 -0800 Received: from cabri.obs-besancon.fr (cabri.obs-besancon.fr [193.52.184.3]) by freefall.cdrom.com (8.6.9/8.6.6) with SMTP id OAA05280 for ; Tue, 10 Jan 1995 14:06:11 -0800 Received: by cabri.obs-besancon.fr (5.57/Ultrix3.0-C) id AA02283; Tue, 10 Jan 95 23:02:02 +0100 Date: Tue, 10 Jan 95 23:02:02 +0100 From: jmz@cabri.obs-besancon.fr (Jean-Marc Zucconi) Message-Id: <9501102202.AA02283@cabri.obs-besancon.fr> To: lsys@np.ac.sg Cc: hackers@FreeBSD.org, lsys@np.ac.sg In-Reply-To: <199501101201.EAA10332@freefall.cdrom.com> (message from SysAdmin - Ng Pheng Siong on Tue, 10 Jan 1995 19:58:21 +0800 (SST)) Subject: Re: Filesystem(?) preformance - 1.x and 2.0 Sender: hackers-owner@FreeBSD.org Precedence: bulk >>>>> "SysAdmin" == SysAdmin <- Ng Pheng Siong > 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. -- ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~ Jean-Marc Zucconi | jmz@cabri.obs-besancon.fr Observatoire de Besancon | F 25010 Besancon cedex | PGP Key: finger jmz@cabri.obs-besancon.fr =========================================================================