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    SubjectRe: [PATCH] Add ext3 data=guarded mode
    On (Thu) Apr 16 2009 [15:42:01], Chris Mason wrote:
    > Hello everyone,
    >
    > Here's an updated (v4) patch for ext3 data=guarded mode. The first two
    > patches in the series are unchanged, and it looks like Linus pulled them
    > in this morning.

    I had written a small program that calculates the time needed to allocate
    a file and zero it using various methods (posix_fallocate, mmap, 4k-chunk
    writes, 8k-chunk writes). I did this on a 20G partition with each method
    creating a file 4G in size. The system has 3G RAM. The program that does
    this is at

    http://fedorapeople.org/gitweb?p=amitshah/public_git/alloc-perf.git;a=blob;f=test-file-zero-alloc-speed.c;hb=HEAD

    with the script to run it for the multiple filesystems at

    http://fedorapeople.org/gitweb?p=amitshah/public_git/alloc-perf.git;a=blob;f=run_test.sh;hb=HEAD

    I have a few results from those runs, time in seconds:

    # 4GiB file, kernel b0cbc861a3c05e634520b049b5cc27ad6febb51f

    filesystem posix-fallocate mmap chunk-4096 chunk-8192
    ext2 74 96 761 81
    ext3-writeback 87 97 202 93
    ext3-ordered 86 94 134 104
    ext4 0 84 120 91
    xfs 0 84 274 81
    reiserfs 85 84 187 98
    btrfs 0 86 121 85

    # 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded

    filesystem posix-fallocate mmap chunk-4096 chunk-8192
    ext3-guarded 85 97 459 90
    ext3-writeback 86 95 140 94
    ext3-ordered 86 96 277 95
    btrfs 0 81 499 93
    xfs 0 79 184 84

    These were with a desktop running with a few terminal sessions and one
    konqueror session (to gauge the times a user will actually see while
    working on her desktop).

    Running the test in single user mode, I get the following results:

    # 4GiB file, kernel 9f76208c33984ab777eace5d07a4e36e88703e02 + ext3-guarded

    filesystem posix-fallocate mmap chunk-4096 chunk-8192
    ext3-guarded 84 86 163 91
    ext3-writeback 84 88 217 91
    ext3-ordered 84 86 226 91
    btrfs 0 76 86 79
    ext4 0 73 195 76

    Amit


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