Date: Thu, 29 Jan 2015 07:07:10 -0800 From: "Chris H" <bsd-lists@bsdforge.com> To: <freebsd-net@freebsd.org> Subject: Re: Zerocopy bpf Message-ID: <8c11690ac977550b52e3494351a44c78@ultimatedns.net> In-Reply-To: <alpine.BSF.2.00.1501281625070.1717@farmermaggot.shire.sentor.se> References: <alpine.BSF.2.00.1501281625070.1717@farmermaggot.shire.sentor.se>
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On Thu, 29 Jan 2015 12:25:25 +0100 (CET) elof2@sentor.se wrote > Hi! > > q1) > I assume that libpcap has builtin support for checking if sysctl > net.bpf.zerocopy_enable is set to 1, and if so uses zerocopy. > Correct? > > q2) > This should mean that all normal sniffing tools like tcpdump, tshark, > ngrep, argus, etc do NOT need any specific options in order to use > zerocopy. > Correct? > > q3) > How do I see if zerocopy is used or not? 'netstat -B' don't tell me > much, and the tool 'bpfstat' don't seem to exist any more. I can't speak from personal experience to the rest. But as to bpfstat(8); it was merged into netstat(1) ~RELENG_7. --Chris > > q4) > When activating zerocopy, should I immediately see a performance boost on > the machine? (like less drops on a heavily loaded sniffer NIC (running in > monitor mode)) > > /Elof > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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