netdev - Re: [PATCH net-next 7/8] net: sched: pie: add derandomization mechanism

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Message-ID: <20181031093827.011d289c@xeon-e3>
Date:   Wed, 31 Oct 2018 09:38:27 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Leslie Monis <lesliemonis@...il.com>
Cc:     jhs@...atatu.com, netdev@...r.kernel.org, tahiliani@...k.edu.in,
        dhavaljkhandla26@...il.com, hrishihiraskar@...il.com,
        bmanish15597@...il.com, sdp.sachin@...il.com
Subject: Re: [PATCH net-next 7/8] net: sched: pie: add derandomization
 mechanism

On Wed, 31 Oct 2018 21:49:31 +0530
Leslie Monis <lesliemonis@...il.com> wrote:

> diff --git a/net/sched/sch_pie.c b/net/sched/sch_pie.c
> index b68b367..88e605c 100644
> --- a/net/sched/sch_pie.c
> +++ b/net/sched/sch_pie.c
> @@ -58,6 +58,7 @@ struct pie_vars {
>  	u32 avg_dq_rate;	/* bytes per pschedtime tick,scaled */
>  	u32 qlen_old;		/* in bytes */
>  	bool active;		/* inactive/active */
> +	u64 accu_prob;		/* accumulated drop probability */
>  };
>  

Although putting it at the end seems like a natural place, it creates
holes in the c structure. My recommendation would be to put the new
field after dq_tsstamp.