netdev - Re: [PATCH 2/4] DSA: Convert msleep calls to usleep

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Date:	Thu, 3 Jan 2013 20:14:16 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Barry Grussling <barry@...ssling.com>
CC:	<netdev@...r.kernel.org>
Subject: Re: [PATCH 2/4] DSA: Convert msleep calls to usleep_range calls

On Wed, 2013-01-02 at 17:54 -0800, Barry Grussling wrote:
> Convert DSA msleep calls to usleep_range calls as reported by
> checkpatch.pl.
> 
> Values of sleep duration were verified on Marvell hardware
> platform and appear to work.  Values chosen are not special
> and no strong "vetting" has gone into them other than verifying
> correct operation on available hardware.
[...]

I seriously doubt that it is worth the trouble to save wake-ups during
the occasional hardware reset.  And using usleep_range() 1000 times is
weird.  If the sleep duration can vary then the right thing to do is
probably to calculate a deadline first (jiffies + HZ) and then sleep
repeatedly until the deadline is in the past.  This also accounts for
the fact that HZ may be < 1000...

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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