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Date: Wed, 3 Sep 2008 09:56:25 +0200 From: "Johann Baudy" <johaahn@...il.com> To: "Evgeniy Polyakov" <johnpol@....mipt.ru> Cc: netdev@...r.kernel.org Subject: Re: Packet mmap: TX RING and zero copy Hi Evgeniy, >> I've made lot of tests, playing with jumbo frames, raw sockets, ... >> I've never exceeded ~25Mbytes/s. So I've decided to analyze deeply the >> packet socket transmission process. >> >> The main blocking point was the memcpy_fromiovec() function that is >> located in the packet_sendmsg() of af_packet.c. > > Can you saturate the link with usual tcp/udp socket? No, only ~15-20Mo/s with standard tcp/udp socket. > >> But, I would like to get as much criticism as possible in order to >> start a discussion with experts about a conceivable way to mix >> zero-copy, sk_buff management and packet socket. >> Which is perhaps impossible with current network kernel flow ... > > Did you try vmsplice and splice? > It is the preferred way to do a zero-copy. Not yet, I will perform some tests using splice and let you know performances. Many thanks, Johann -- Johann Baudy johaahn@...il.com -- 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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