Maybe of relevance to fedora developers since ext3 reservation patch was first introduced in Fedora. Not sure how close the current patch in FC3 is to the one in 2.6.10-rc2 Would appreciate if others could try the same benchmark with different i/o controllers (ATA/SATA/3ware/Fibre) ----- Forwarded message from Yusuf Goolamabbas <yusufg@xxxxxxxxxxxx> ----- Date: Mon, 15 Nov 2004 14:33:25 +0800 From: Yusuf Goolamabbas <yusufg@xxxxxxxxxxxx> To: linux-kernel@xxxxxxxxxxxxxxx Subject: ext3 reservation seems to cause major slowdown in synctest in 2.6.10-rc2 vs 2.6.9 Message-ID: <20041115063325.GA31537@xxxxxxxxxxxx> I have a P3-500 box /384 MB ram and 2 scsi disks (sda and sdb). OS is on sda and test partions is on sdb aic7xxx driver Using anticipatory schedulor with a tag_depth of 4 (this is set via modules.conf) options aic7xxx aic7xxx=global_tag_depth:4 /dev/sdb1 is created with ext3 and htree is enabled. Mounted as /htree synctest obtained from here (synctest tries to simulate an MTA behaviour) http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz I run the following commands on both 2.6.9 and 2.6.10-rc2 /usr/bin/time -p ./synctest -fu -t 100 -p1 -n1 /htree/nfsexport timing results 2.6.9 real 57.35 user 1.37 sys 14.26 2.6.10-rc2 real 86.83 user 1.32 sys 14.02 Mounting with noreservation gives the following numbers real 58.77 user 1.46 sys 14.48 ----- End forwarded message -----
