Re: 2.6.36 io bring the system to its knees

[Linus Torvalds]

On Sun, Nov 7, 2010 at 4:08 AM, Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> As already mentioned, ext3 is just not a good choice for this sort of
> thing. Did you have atimes enabled?

At least for ext3, more important than atimes is the "data=writeback"
setting. Especially since our atime default is sane these days (ie if
you don't specify anything, we end up using 'relatime').

If you compile your own kernel, answer "N" to the question

  Default to 'data=ordered' in ext3?

at config time (CONFIG_EXT3_DEFAULTS_TO_ORDERED), or you can make sure
"data=writeback" is in the fstab (but I don't think everything honors
it for the root filesystem).

                                   Linus
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