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Date: Wed, 27 Aug 2014 14:36:52 -0700 (PDT) From: David Miller <davem@...emloft.net> To: brouer@...hat.com Cc: netdev@...r.kernel.org, dborkman@...hat.com, hannes@...essinduktion.org, cwang@...pensource.com Subject: Re: [RFC PATCH] pktgen: skb bursting via skb->xmit_more API From: Jesper Dangaard Brouer <brouer@...hat.com> Date: Wed, 27 Aug 2014 23:13:00 +0200 > This patch just demonstrates the effect of delaying the HW tailptr, > the skb->xmit_more API should likely have some wrappers. > > One issue is the possible need to flush/write the tailptr on > the exit path... marked with FIXME. ... > Performance > skb_burst=0 tx:5614370 pps > skb_burst=1 tx:5571279 pps ( -1.38 ns (worse)) > skb_burst=2 tx:6942821 pps ( 35.46 ns) > skb_burst=3 tx:7556214 pps ( 11.69 ns) > skb_burst=4 tx:7740632 pps ( 3.15 ns) > skb_burst=5 tx:7972489 pps ( 3.76 ns) > skb_burst=6 tx:8129856 pps ( 2.43 ns) > skb_burst=7 tx:8281671 pps ( 2.25 ns) > skb_burst=8 tx:8383790 pps ( 1.47 ns) > skb_burst=9 tx:8451248 pps ( 0.95 ns) > skb_burst=10 tx:8503571 pps ( 0.73 ns) > skb_burst=16 tx:8745878 pps ( 3.26 ns) > skb_burst=24 tx:8871629 pps ( 1.62 ns) > skb_burst=32 tx:8945166 pps ( 0.93 ns) > > skb_burst=(0 vs 32) improvement: > (1/5614370*10^9)-(1/8945166*10^9) = 66.32 ns > + 3330796 pps Thanks for doing these tests Jesper. -- 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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