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On Wed, Jul 27, 2005 at 04:16:00PM +0100, Alessandra Forti wrote: > Hi Kostas, > > can you expand the etc on the tuning? It looks interesting. It depends on the workload of the machine but i usually try things like: mount with data=writeback for ext3 RHEL3 (2.4) ----------- sysctl -w vm.max-readahead=1024 sysctl -w vm.bdflush = 30 500 0 0 100 500 60 20 0 sysctl -w vm.pagecache = 1 5 30 sysctl -w vm.inactive_clean_percent = 70 $ elvtune -r 256 -w 1024 /dev/sda RHEL4 (2.6) ----------- sysctl -w vm.dirty_expire_centisecs = 1000 sysctl -w vm.dirty_writeback_centisecs = 500 sysctl -w vm.dirty_ratio = 5 sysctl -w vm.dirty_background_ratio = 10 sysctl -w vm.swappiness=0 $ echo 512 > /sys/block/sda/queue/nr_requests $ blockdev --setra 1024 /dev/sda Cheers, Kostas