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Date: Wed, 22 Jul 2009 10:12:17 -0700 From: Bob Gilligan <gilligan@...tta.com> To: Ben Hutchings <bhutchings@...arflare.com> CC: Jesper Dangaard Brouer <hawk@...u.dk>, jon_zhou@...lent.com, netdev@...r.kernel.org Subject: Re: the maximal speed of pktgen with 1Gbps NIC Ben Hutchings wrote: > On Wed, 2009-07-22 at 14:56 +0200, Jesper Dangaard Brouer wrote: >> On Wed, 22 Jul 2009, jon_zhou@...lent.com wrote: >> >>> anyone knows the maximal speed of pktgen with 1Gbps NIC? >> You are limited by the number of packets per second (pps) your machine can >> generate. This limitation is given by the CPU speed and the NIC used. >> >> The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps. >> >> 1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps. >> (1000*10^6/(64*8) = 1953125) > [...] > > You need to take the inter-packet gap into consideration too. Yes. Usually when people talk about the "64-byte PPS rate" they are referring to the maximum rate of minimum size ethernet frames. The 64-bytes includes the src/dst addr fields, type field and CRC, but does not include the preamble (7 bytes), SOF (1 byte) or IPG (12 bytes). Adding these in gives a minimum size frame of 84 bytes. This works out to a max rate of ( 1,000,000,000 / (84 * 8) ) = 1,488,095 PPS. Bob. -- 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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