Cc: Andrew Morton <akpm@...>, Christoph Lameter <clameter@...>, <linux-kernel@...>, Mel Gorman <mel@...>, William Lee Irwin III <wli@...>, Jens Axboe <jens.axboe@...>, Badari Pulavarty <pbadari@...>, Maxim Levitsky <maximlevitsky@...>
On Sat, Apr 28, 2007 at 02:36:20AM +1000, David Chinner wrote:
Some more information - stripe unit on the dm raid0 is 512k.
I have not attempted to increase I/O sizes at all yet - these test are
just demonstrating efficiency improvements in the filesystem.
These numbers for 32GB files.
READ WRITE
disks blksz tput sys tput sys
----- ----- ----- ---- ----- ----
1 4k 89 18s 57 44s
1 16k 46 13s 67 18s
1 64k 75 12s 68 12s
2 4k 179 20s 114 43s
2 16k 55 13s 132 18s
2 64k 126 12s 126 12s
4 4k 350 20s 214 43s
4 16k 350 14s 264 19s
4 64k 176 11s 266 12s
8 4k 415 21s 446 41s
8 16k 655 13s 518 19s
8 64k 664 12s 552 12s
12 4k 413 20s 633 33s
12 16k 736 14s 741 19s
12 64k 836 12s 743 12s
Throughput in MB/s.
Consistent improvement across the write results, first time
I've hit the limits of the PCI-X bus with a single buffered
I/O thread doing either reads or writes.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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