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Date: Fri, 29 Aug 2014 09:17:06 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Jesper Dangaard Brouer <brouer@...hat.com> Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org, Ben Greear <greearb@...delatech.com>, Robert Olsson <robert@...julf.se> Subject: Re: [net-next PATCH] pktgen: add flag NO_TIMESTAMP to disable timestamping On Thu, 2014-08-28 at 18:14 +0200, Jesper Dangaard Brouer wrote: > 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. I guess using local_clock() would provide an accurate and less expensive timestamp, if a timestamp is needed. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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