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    SubjectRe: [00/17] Large Blocksize Support V3
    On Sat, Apr 28, 2007 at 02:36:20AM +1000, David Chinner wrote:
    > The test was writing a single 50GB file to a fresh filesystem, and
    > then reading it back. Run on two different dm stripes - a 4-disk
    > RAID) and a 8disk RAID0 stripe, with a stripe unit of 512k. Disks
    > are 10krpm SAS, external jbod on PCI-X good for ~850MB/s read and
    > ~750MB/s write. Server is 4p intel x86_64 with 16GB RAM.
    >
    > READ WRITE
    > blksz disks tput sys tput sys
    > ----- ----- ----- ---- ----- ----
    > 4k 4 332 35s 203 76s
    > 64k 4 173 20s 273 21s
    > 4k 8 403 35s 443 76s
    > 64k 8 634 21s 540 21s
    >
    > Throughput in MB/s.

    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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