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DateTue, 07 Aug 2007 15:09:54 -0400
FromBill Davidsen <>
SubjectRe: [PATCH 00/23] per device dirty throttling -v8
Alan Cox wrote:
>> i cannot over-emphasise how much of a deal it is in practice. Atime 
>> updates are by far the biggest IO performance deficiency that Linux has 
>> today. Getting rid of atime updates would give us more everyday Linux 
>> performance than all the pagecache speedups of the past 10 years, 
>> _combined_.>>>> it's also perhaps the most stupid Unix design idea of all times. Unix is 
>> really nice and well done, but think about this a bit:> > Think about the user for a moment instead. > > Do things right. The job of the kernel is not to "correct" for
> distribution policy decisions. The distributions need to change policy.
> You do that by showing the distributions the numbers. 
> 
> With a Red Hat on if we can move from /dev/hda to /dev/sda in FC7 then we
> can move from atime to noatime by default on FC8 with appropriate release
> note warnings and having a couple of betas to find out what other than
> mutt goes boom.

Is there really enough benefit between relatime and noatime to justify 
that? If atime doesn't get updated at all it *will* impact operations, 
and unless there's a real performance gain the path which provides at 
least nominal POSIX compliance seems best.

Plauger's law of least astonishment.

-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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