netdev - Re: [net-next PATCH V6 2/2] qdisc: dequeue bulking also pickup GSO/TSO packets

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Date:	Thu, 02 Oct 2014 07:35:28 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Florian Westphal <fw@...len.de>,
	Daniel Borkmann <dborkman@...hat.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Alexander Duyck <alexander.duyck@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Dave Taht <dave.taht@...il.com>, toke@...e.dk
Subject: Re: [net-next PATCH V6 2/2] qdisc: dequeue bulking also pickup
 GSO/TSO packets

On Wed, 2014-10-01 at 22:36 +0200, Jesper Dangaard Brouer wrote:
> The TSO and GSO segmented packets already benefit from bulking
> on their own.
> 

> 
> Signed-off-by: Florian Westphal <fw@...len.de>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> ---
> 
>  net/sched/sch_generic.c |   12 +++---------
>  1 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
> index c2e87e6..797ebef 100644
> --- a/net/sched/sch_generic.c
> +++ b/net/sched/sch_generic.c
> @@ -63,10 +63,6 @@ static struct sk_buff *try_bulk_dequeue_skb(struct Qdisc *q,
>  	struct sk_buff *skb, *tail_skb = head_skb;
>  
>  	while (bytelimit > 0) {
> -		/* For now, don't bulk dequeue GSO (or GSO segmented) pkts */
> -		if (tail_skb->next || skb_is_gso(tail_skb))
> -			break;
> -
>  		skb = q->dequeue(q);
>  		if (!skb)
>  			break;
> @@ -76,11 +72,9 @@ static struct sk_buff *try_bulk_dequeue_skb(struct Qdisc *q,
>  		if (!skb)
>  			break;
>  
> -		/* "skb" can be a skb list after validate call above
> -		 * (GSO segmented), but it is okay to append it to
> -		 * current tail_skb->next, because next round will exit
> -		 * in-case "tail_skb->next" is a skb list.
> -		 */
> +		while (tail_skb->next) /* GSO list goto tail */
> +			tail_skb = tail_skb->next;
> +
>  		tail_skb->next = skb;
>  		tail_skb = skb;

Thanks a lot guys. I am testing this patch set today.


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