netdev - RE: [Xen-devel] [PATCH net] xen-netback: add the scenario which now beyond the range time_after

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B73A7@saturn3.aculab.com>
Date:	Thu, 24 Oct 2013 11:04:45 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Jan Beulich" <jbeulich@...e.com>, <wei.liu2@...rix.com>,
	<jianhai.luan@...cle.com>
Cc:	<david.vrabel@...rix.com>, <ian.campbell@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <annie.li@...cle.com>,
	<netdev@...r.kernel.org>
Subject: RE: [Xen-devel] [PATCH net] xen-netback: add the scenario which now beyond the range time_after_eq().

> >> As I understand it, this is the idea of this patch -- to narrow down the
> >> timing window.
> >Jan,  do you agree the idea or have better suggestion to me.
> 
> As said before - I disagree (reducing a timing window is never a solution,
> only eliminating it is), and I pointed at the alternative (using 64-bit
> calculations) before.

If the error is reduced to a few seconds in 48 days (at 1kHz HZ) and the
system has to be idle for the 48 days I wouldn't be too worried.
Especially if this is 'time based credit' and the effect is just that
of the link (or whatever) being busy rather than idle.

	David



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