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    SubjectRe: Slow swapon for big (12GB) swap
    Grzegorz Kulewski <> wrote:
    > I am using big swap here (as a backing for potentially huge tmpfs). And I
    > wonder why swapon on such big (like 12GB) swap takes about 7 minutes
    > (continuous disk IO).

    It's a bit quicker here:

    vmm:/usr/src/25# mkswap /dev/hda6
    Setting up swapspace version 1, size = 54031826 kB
    vmm:/usr/src/25# time swapon /dev/hda6
    swapon /dev/hda6 0.00s user 0.04s system 74% cpu 0.054 total

    > Is this expected?


    > Why it is like that?

    Are you using a swapfile or a swap partition?

    If it's a swapfile then perhaps the filesystem is being inefficient in its
    bmap() function. Which filesystem is it?

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      Last update: 2006-04-10 10:43    [W:0.019 / U:153.640 seconds]
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