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    SubjectRe: [BUG] fatal hang untarring 90GB file, possibly writeback related.
    On Wed, 2011-04-27 at 19:25 +0100, Colin Ian King wrote:
    > Just like to add that I've seen almost identical issues with 2.6.38
    > copying large amounts of data to an ext4 filesystem with systems with
    > small amounts of memory.
    > I found that increasing /sys/fs/ext4/sdaX/max_writeback_mb_bump worked
    > around the issue.

    With the PREEMPT kernel, values of 256 and 512 don't prevent kswapd
    spinning up to 99% and staying there.


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