Justin Piszcz wrote: > RAID 5 TWEAKED: 1:06.41 elapsed @ 60% CPU > > This should be 1:14 not 1:06(was with a similarly sized file but not the > same) the 1:14 is the same file as used with the other benchmarks. and to > get that I used 256mb read-ahead and 16384 stripe size ++ 128 > max_sectors_kb (same size as my sw raid5 chunk size) max_sectors_kb is probably your key. On my system I get twice the read performance by just reducing max_sectors_kb from default 512 to 192. Can you do a fresh reboot to shell and then: $ cat /sys/block/hda/queue/* $ cat /proc/meminfo $ echo 3 > /proc/sys/vm/drop_caches $ dd if=/dev/hda of=/dev/null bs=1M count=10240 $ echo 192 > /sys/block/hda/queue/max_sectors_kb $ echo 3 > /proc/sys/vm/drop_caches $ dd if=/dev/hda of=/dev/null bs=1M count=10240 Thanks! -- Al - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
