netdev - Re: [net-next PATCH] pktgen: add flag NO_TIMESTAMP to disable timestamping

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Message-Id: <20140901.180718.1517902146681973349.davem@davemloft.net>
Date:	Mon, 01 Sep 2014 18:07:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	brouer@...hat.com
Cc:	netdev@...r.kernel.org, greearb@...delatech.com, robert@...julf.se
Subject: Re: [net-next PATCH] pktgen: add flag NO_TIMESTAMP to disable
 timestamping

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Thu, 28 Aug 2014 18:14:47 +0200

> Then testing the TX limits of the stack, then it is useful to
> be-able to disable the do_gettimeofday() timetamping on every packet.
> 
> This implements a pktgen flag NO_TIMESTAMP which will disable this
> call to do_gettimeofday().
> 
> The performance change on (my system E5-2695) with skb_clone=0, goes
> from TX 2,423,751 pps to 2,567,165 pps with flag NO_TIMESTAMP. Thus,
> the cost of do_gettimeofday() or saving is approx 23 nanosec.
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

This is fine, applied, thanks!
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