netdev - Re: [PATCH v2] net: Performance fix for process

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Date:	Mon, 30 Jun 2014 12:28:34 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: Performance fix for process_backlog

On Mon, 2014-06-30 at 09:50 -0700, Tom Herbert wrote:
> In process_backlog the input_pkt_queue is only checked once for new
> packets and quota is artificially reduced to reflect precisely the
> number of packets on the input_pkt_queue so that the loop exits
> appropriately.
> 
> This patches changes the behavior to be more straightforward and
> less convoluted. Packets are processed until either the quota
> is met or there are no more packets to process.
> 
> This patch seems to provide a small, but noticeable performance
> improvement. The performance improvement is a result of staying
> in the process_backlog loop longer which can reduce number of IPI's.

Yes, this is likely the fact that napi->state is cleared at the very end
of the run.

Acked-by: Eric Dumazet <edumazet@...gle.com>

Thanks Tom !


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