Messages in this thread | | | Date | Mon, 15 Mar 2004 21:22:56 -0800 | From | Jeremy Higdon <> | Subject | Re: [PATCH] per-backing dev unplugging #2 |
| |
| Hi, | | Final version, unless something stupid pops up. Changes: | | - Adapt to 2.6.4-mm1 | - Cleaned up the dm bits, much nicer with the lockless unplugging | (thanks Joe) | - md and loop unplugging, stacked devices should unplug their targets. | Otherwise they'll end up waiting for the unplug timer, which sucks. | - XFS fixed up, I hope. XFS folks still encouraged to look at this, | looks better this time around though (and works, I tested). | - blk_run_* inlined in blkdev.h | | Against 2.6.4-mm1 (note you need other attached patch to boot it).
I got a chance to try this.
It makes a huge improvement.
Prior to the last per-cpu patch, I was getting about 75000 to 80000 IOPS at 100% cpu usage.
With the per-cpu patch, that went up to 110000 IOPS at 100% CPU.
With this patch, I'm seeing 200000 IOPS at about 65% CPU usage.
So it makes a tremendous improvement in I/O scalability, dramatically improving performance in small size I/O, high I/O count workloads.
My tests were on an 8 CPU x 1300 MHz Altix with 64 disks.
jeremy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |