From 511c245f1aeae29034da57a415ca5354b29b1aa7 Mon Sep 17 00:00:00 2001 From: brueffer Date: Mon, 11 Nov 2013 14:08:25 +0000 Subject: [PATCH] MFC: r257287 New sentence -> new line and some mdoc cleanup. Approved by: re (glebius) git-svn-id: svn://svn.freebsd.org/base/stable/10@257990 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- share/man/man4/bpf.4 | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/share/man/man4/bpf.4 b/share/man/man4/bpf.4 index 4095f5e62..072f8e099 100644 --- a/share/man/man4/bpf.4 +++ b/share/man/man4/bpf.4 @@ -697,9 +697,11 @@ is used when the time stamp is set to .Dv BPF_T_MICROTIME_MONOTONIC_FAST , or .Dv BPF_T_NONE -for backward compatibility reasons. Otherwise, +for backward compatibility reasons. +Otherwise, .Vt bpf_xhdr -is used. However, +is used. +However, .Vt bpf_hdr may be deprecated in the near future. Suitable precautions @@ -962,19 +964,23 @@ subsystem .It Va net.bpf.optimize_writers: No 0 Various programs use BPF to send (but not receive) raw packets (cdpd, lldpd, dhcpd, dhcp relays, etc. are good examples of such programs). -They do not need incoming packets to be send to them. Turning this option on +They do not need incoming packets to be send to them. +Turning this option on makes new BPF users to be attached to write-only interface list until program explicitly specifies read filter via -.Cm pcap_set_filter() . +.Fn pcap_set_filter . This removes any performance degradation for high-speed interfaces. .It Va net.bpf.stats: Binary interface for retrieving general statistics. .It Va net.bpf.zerocopy_enable: No 0 -Permits zero-copy to be used with net BPF readers. Use with caution. +Permits zero-copy to be used with net BPF readers. +Use with caution. .It Va net.bpf.maxinsns: No 512 -Maximum number of instructions that BPF program can contain. Use +Maximum number of instructions that BPF program can contain. +Use .Xr tcpdump 1 --d option to determine approximate number of instruction for any filter. +.Fl d +option to determine approximate number of instruction for any filter. .It Va net.bpf.maxbufsize: No 524288 Maximum buffer size to allocate for packets buffer. .It Va net.bpf.bufsize: No 4096 -- 2.45.0