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Date: Thu, 9 Aug 2007 22:18:23 +0400 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Unai Uribarri <unai.uribarri@...enet.com> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/1] af_packet: don't enable timestamps in mmap'ed sockets On Thu, Aug 09, 2007 at 08:13:54PM +0200, Unai Uribarri (unai.uribarri@...enet.com) wrote: > On jue, 2007-08-09 at 18:33 +0400, Evgeniy Polyakov wrote: > > On Thu, Aug 09, 2007 at 04:21:54PM +0200, Unai Uribarri (unai.uribarri@...enet.com) wrote: > > > The attached patch removes the automatic timestamp activation, that > > > only mmap'ed AF_PACKET sockets perform. I known it can break user > > > applications, but I believe that it's the correct solution. > > > > How tcpdump with mmap libpcap will work with it? > > In Linux, you can enable timestamps on any socket executing: > > int val = 1; > setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &val, sizeof(val)); > > PD: Current release of tcpdump doesn't mmap the reception ring and > timestamps packets at user space with gettimeofday. It isn't the best > performing alternative, but it's portable. IIRC, there was/is a libpcap which worked with mapped sockets, mybe not official though. Any application which depened on having timestamps with packets will not work now. Why not to implement an absolutely_turn_off_timestamps option instead of breaking compatibility? -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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