Date: Thu, 29 Jan 2015 12:25:25 +0100 (CET) From: elof2@sentor.se To: freebsd-net <freebsd-net@freebsd.org> Subject: Zerocopy bpf Message-ID: <alpine.BSF.2.00.1501281625070.1717@farmermaggot.shire.sentor.se>
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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. 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
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