Stan Hoeppner <stan <at> hardwarefreak.com> writes: > ~$ cat /sys/block/sda/queue/scheduler > [CFQ] noop deadline > Wes, yours will show CFQ probably as the default on RHEL/CentOS. You'll > want deadline for best seek and all around performance. So: > ~$ echo deadline > /sys/block/sda/queue/scheduler > Add that to an init script or cron entry so it sets on every boot. > Barriers are not an issue with this test. > Thank you all. The issue is now closed. RHEL5 was not doing cache flush right. It was only corrected in 2.6.32+ After removing O_SYNC from seekmark the results are now comparable. Actually it is hard to find a linux raw device random R/W benchmark tool and seekmark being the most popular fails when comparing pre and post 2.6.32 systems (unless you remove O_SYNC). -- 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
