Andrew Morton wrote:
quoted text
> On Fri, 26 Oct 2007 21:33:40 +0200
> Ingo Molnar <mingo@elte.hu> wrote:
> 
>> * Andrew Morton <akpm@linux-foundation.org> wrote:
>>

quoted text
>> so a final 'sync' should be added to the test too, and the time it takes 
>> factored into the bandwidth numbers?
> 
> That's one way of doing it.  Or just run the test for a "long" time.  ie:
> much longer than (total-memory / disk-bandwidth).  Probably the latter
> will give a more accurate result, but it can get boring.
> 
Longer might be less inaccurate, but without flushing the last data you 
really don't get best accuracy, you just reduce the error. Clearly doing 
fdatasync() is best, since other i/o caused by sync() can skew the results.

-- 
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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