Re: [PATCH] NFS: Add acreg{min,max} and acdir{min, max} in milliseconds

["NeilBrown" <neilb@suse.de>]

On Tue, June 16, 2009 8:53 am, Amit Gud wrote:
> Trond Myklebust wrote:
>> It boils down to this: I'm extremely reluctant to get into an arms race
>> of adding ever more mount options for increasingly finer-tuned attribute
>> cache timeouts. While such an option may meet _your_ machine room
>> requirements here and now, it becomes tiresome over the years as
>> machines gain power, and people first start lobbying for millisecond
>> timeouts, then microseconds, nanoseconds, pico... in order to catch up.
>>
>
> It only makes sense to make machines more powerful and put that power to
> optimum use. If keeping up with increased resolution is an issue, you
> think something like "-o unit=ms acregmin=..." would be better? 'unit'
> can apply to all the time related options defaulting to seconds.

Wasn't this problem solved hundreds of years ago by the invention
of the decimal point :-)

  -o acregmin=0.0012

Write the code to use as much precision as makes sense given the value
of HZ - and round up.  No new mount options.

NeilBrown