netdev - Re: [PATCH net-next] net_sched: gen_estimator: account for timer drifts

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Message-Id: <20161203.161234.605773166761239343.davem@davemloft.net>
Date:   Sat, 03 Dec 2016 16:12:34 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net_sched: gen_estimator: account for timer
 drifts

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 02 Dec 2016 08:11:00 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Under heavy stress, timer used in estimators tend to slowly be delayed
> by a few jiffies, leading to inaccuracies.
> 
> Lets remember what was the last scheduled jiffies so that we get more
> precise estimations, without having to add a multiply/divide in the loop
> to account for the drifts.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.