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

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Message-Id: <20140707.192519.1302110449886053251.davem@davemloft.net>
Date:	Mon, 07 Jul 2014 19:25:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: Performance fix for process_backlog

From: Tom Herbert <therbert@...gle.com>
Date: Mon, 30 Jun 2014 09:50:40 -0700 (PDT)

> 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.
> 
> Performance data using super_netperf TCP_RR with 200 flows:
...
> Signed-off-by: Tom Herbert <therbert@...gle.com>

Applied, thanks Tom.
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