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MFC: r257287

New sentence -> new line and some mdoc cleanup.

Approved by:	re (glebius)
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1 parent add016b commit 46450a501467d06008233f1d8f85b126337526c2 @cbrueffer cbrueffer committed Nov 11, 2013
Showing with 13 additions and 7 deletions.
  1. +13 −7 share/man/man4/bpf.4
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@@ -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

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