netdev - Re: [PATCH] pkt_sched: gen_estimator: use 64 bits intermediate counters for bps

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Message-ID: <20090519070252.GA4210@ff.dom.local>
Date:	Tue, 19 May 2009 07:02:52 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	David Miller <davem@...emloft.net>, vexwek@...il.com,
	netdev@...r.kernel.org, kaber@...sh.net, devik@....cz
Subject: Re: [PATCH] pkt_sched: gen_estimator: use 64 bits intermediate
	counters for bps

On Tue, May 19, 2009 at 01:59:55AM +0200, Eric Dumazet wrote:
...
> diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
...
> -		e->avbps += ((long)rate - (long)e->avbps) >> e->ewma_log;
> +		e->avbps += ((s64)(brate - e->avbps)) >> e->ewma_log;

Btw., I'm a bit concerned about the syntax here: isn't such shifting
of signed ints implementation dependant?

Jarek P.
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