]>
git.proxmox.com Git - mirror_iproute2.git/blob - tc/tc_red.c
2 * tc_red.c RED maintanance routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
28 Plog = log(prob/(qmax - qmin))
30 int tc_red_eval_P(unsigned qmin
, unsigned qmax
, double prob
)
39 for (i
=0; i
<32; i
++) {
50 burst + 1 - qmin/avpkt < (1-(1-W)^burst)/W
53 int tc_red_eval_ewma(unsigned qmin
, unsigned burst
, unsigned avpkt
)
57 double a
= (double)burst
+ 1 - (double)qmin
/avpkt
;
61 for (wlog
=1; wlog
<32; wlog
++, W
/= 2) {
62 if (a
<= (1 - pow(1-W
, burst
))/W
)
69 Stab[t>>Scell_log] = -log(1-W) * t/xmit_time
72 int tc_red_eval_idle_damping(int Wlog
, unsigned avpkt
, unsigned bps
, __u8
*sbuf
)
74 double xmit_time
= tc_calc_xmittime(bps
, avpkt
);
75 double lW
= -log(1.0 - 1.0/(1<<Wlog
))/xmit_time
;
76 double maxtime
= 31/lW
;
82 for (clog
=0; clog
<32; clog
++) {
83 if (maxtime
/(1<<clog
) < 512)
90 for (i
=1; i
<255; i
++) {
91 sbuf
[i
] = (i
<<clog
)*lW
;