netdev - Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e

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Date:	Wed, 30 May 2012 04:20:17 -0700
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hiroaki SHIMODA <shimoda.hiroaki@...il.com>,
	Tom Herbert <therbert@...gle.com>,
	Denys Fedoryshchenko <denys@...p.net.lb>,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	davem@...emloft.net
Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86)
 and e1000e

On Wed, 2012-05-30 at 13:08 +0200, Eric Dumazet wrote:
> Maybe we should change all POSDIFF(), not selected ones.
> #define POSDIFF(A, B) ((int)((A) - (B)) > 0 ? (A) - (B) : 0)

maybe use an eval once statement expression macro
({
	typeof (A) _a = (A);
	typeof (B) _b = (B);
	((int)(_a - _b) > 0 ? _a - _b : 0;
})


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