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author | mav <mav@FreeBSD.org> | 2007-05-16 12:00:22 +0000 |
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committer | mav <mav@FreeBSD.org> | 2007-05-16 12:00:22 +0000 |
commit | fb7a9f1bb76db549714230a69aa87823a362c9fe (patch) | |
tree | 9e43bf9a15bad7bfff234314e8857a05f2f649bb /share/man/man4/ng_car.4 | |
parent | 7ff161914ef497787d1f0b46938966ecd6ec85f4 (diff) | |
download | FreeBSD-src-fb7a9f1bb76db549714230a69aa87823a362c9fe.zip FreeBSD-src-fb7a9f1bb76db549714230a69aa87823a362c9fe.tar.gz |
Text reformatting.
Approved by: glebius (mentor)
Diffstat (limited to 'share/man/man4/ng_car.4')
-rw-r--r-- | share/man/man4/ng_car.4 | 57 |
1 files changed, 32 insertions, 25 deletions
diff --git a/share/man/man4/ng_car.4 b/share/man/man4/ng_car.4 index de0d9f67..ab9ee3c 100644 --- a/share/man/man4/ng_car.4 +++ b/share/man/man4/ng_car.4 @@ -36,7 +36,7 @@ .Sh DESCRIPTION The .Nm car -node type limits traffic flowing through it using: +node type limits traffic flowing through it using: .Pp .Bl -bullet -compact .It @@ -61,45 +61,52 @@ Traffic flowing from .Va upper to .Va lower -is considered +is considered .Sy downstream traffic. -Traffic flowing from +Traffic flowing from .Va lower to -.Va upper -is considered -.Sy upstream +.Va upper +is considered +.Sy upstream traffic. .Sh MODES OF OPERATION -Each hook can operate in one of modes: +Each hook can operate in one of the following modes: .Bl -tag -width indent .It Dv NG_CAR_SINGLE_RATE Single rate three color marker as described on RFC 2697. -Committed burst packets are counted as green, extended burst packets are counted as yellow -and exceeding packets are counted as red. Committed burst getting refilled with cir speed. +Committed burst packets are counted as green, extended burst packets are +counted as yellow and exceeding packets are counted as red. +Committed burst getting refilled with CIR (Committed Information Rate) speed. When it is full, exceeded burst getting refilled. .It Dv NG_CAR_DOUBLE_RATE Two rate three color marker as described on RFC 2698. -Committed burst packets are counted as green, peak burst packets are counted as yellow -and exceeding packets are counted as red. Committed burst getting refilled with cir speed. -Peak burst getting refilled with pir speed at the same time. +Committed burst packets are counted as green, peak burst packets are counted +as yellow and exceeding packets are counted as red. +Committed burst getting refilled with CIR speed. +Peak burst getting refilled with PIR (Peak Information Rate) speed at the +same time. .It Dv NG_CAR_RED -Alike to NG_CAR_SINGLE_RATE, but with different understanding of extended burst. -When normal burst exceeded and extended burst is used, packets are counted red with -probability equal to part of extended burst consumed. Extended burst getting refilled first. -When it is full, committed burst getting refilled. This behavior is alike to RED -active queue management algorithm. +Similar to +.Dv NG_CAR_SINGLE_RATE , +but with different understanding of extended burst. +When normal burst exceeded and extended burst is used, packets are counted +red with probability equal to part of extended burst consumed. +Extended burst getting refilled first. +When it is full, committed burst getting refilled. +This behavior is similar to RED active queue management algorithm. .Pp This algorithm is more polite to the TCP traffic then NG_CAR_SINGLE_RATE. .It Dv NG_CAR_SHAPE -Committed burst packets are counted as green, exceeding packets are delayed -by queue with RED management and counted as yellow. Packets dropped by queue counted as red. +Committed burst packets are counted as green, exceeding packets are delayed +by queue with RED management and counted as yellow. +Packets dropped by queue counted as red. Queue parameters are hardcoded: length 99 packets, min_th 8 packets, max_p 100%. .Pp -Traffic shaping is much more polite to the TCP traffic then rate limit on links with -bandwidth * delay product less then 6-8 TCP segments, but it consumes additional system -resources for queue processing. +Traffic shaping is much more polite to the TCP traffic then rate limit on +links with bandwidth * delay product less then 6-8 TCP segments, but it +consumes additional system resources for queue processing. .El .Sh CONTROL MESSAGES This node type supports the generic control messages and the following @@ -111,7 +118,7 @@ Set node configuration to the specified at .It Dv NGM_CAR_GET_CONF Pq Li getconf Return current node configuration as .Vt "struct ng_car_bulkconf" -.Bd -literal -offset 4n +.Bd -literal struct ng_car_hookconf { u_int64_t cbs; /* Committed burst size (bytes) */ u_int64_t ebs; /* Exceeded/Peak burst size (bytes) */ @@ -132,7 +139,7 @@ struct ng_car_bulkconf { .It Dv NGM_CAR_GET_STATS Pq Li getstats Return node statistics as .Vt "struct ng_car_bulkstats" -.Bd -literal -offset 4n +.Bd -literal struct ng_car_hookstats { u_int64_t passed_pkts; u_int64_t droped_pkts; @@ -173,4 +180,4 @@ control message, or when all hooks have been disconnected. .An Nuno Antunes Aq nuno.antunes@gmail.com .An Alexander Motin Aq mav@alkar.net .Sh BUGS -For this moment only DROP and FORWARD actions are implemented. +At this moment only DROP and FORWARD actions are implemented. |