netdev - Re: [RFC PATCH 08/13] net: sched: support skb_bad

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Message-ID: <1471474686.29842.53.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Wed, 17 Aug 2016 15:58:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	xiyou.wangcong@...il.com, jhs@...atatu.com,
	alexei.starovoitov@...il.com, brouer@...hat.com,
	john.r.fastabend@...el.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [RFC PATCH 08/13] net: sched: support skb_bad_tx with lockless
 qdisc

On Wed, 2016-08-17 at 12:36 -0700, John Fastabend wrote:
> Similar to how gso is handled skb_bad_tx needs to be per cpu to handle
> lockless qdisc with multiple writer/producers.
\
> @@ -1021,6 +1026,7 @@ err_out4:
>  	free_percpu(sch->cpu_bstats);
>  	free_percpu(sch->cpu_qstats);
>  	free_percpu(sch->gso_cpu_skb);
> +	free_percpu(sch->skb_bad_txq_cpu);


This might be the time to group all these per cpu allocations to a
single one, to help data locality and decrease overhead of having XX
pointers.