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Date:	Sun, 05 Oct 2014 16:59:32 -0700
From:	Eric Dumazet <>
To:	Thomas Gleixner <>
Cc:	Christoph Lameter <>,
	Richard Cochran <>,
Subject: Re: Why do we still have 32 bit counters? Interrupt counters
 overflow within 50 days

On Sun, 2014-10-05 at 23:49 +0200, Thomas Gleixner wrote:

> Whats so hard about 64bit counters on 32bit machines?

Not hard, but not trivial either.

> > expensive to handle in particular because these counters are used in
> > performance critical hotpaths.
> The expensive overhead is a single "adcl" instruction.

Assuming a reader do not care of reading garbage yes, while carry is not
yet propagated.

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