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madwifi: put an upper limit on the amount of sampling that minstrel should do when

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the link changes its status from very good to slightly bad. the previous version
of the patch could have resulted in erratic rate control behavior when there
was a lot of sampling backlog.


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10921 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2008-04-22 23:35:27 +00:00
parent add5d6ec82
commit 82bf60b712
1 changed files with 24 additions and 12 deletions
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36
package/madwifi/patches/345-minstrel_sampling.patch
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@ -1,7 +1,7 @@
Index: madwifi-trunk-r3314/ath/if_ath.c
===================================================================
--- madwifi-trunk-r3314.orig/ath/if_ath.c 2008-04-21 02:44:23.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_ath.c 2008-04-21 03:33:02.000000000 +0200
--- madwifi-trunk-r3314.orig/ath/if_ath.c 2008-04-21 09:13:19.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_ath.c 2008-04-23 01:15:49.000000000 +0200
@@ -8095,6 +8095,7 @@
ath_hal_setupxtxdesc(sc->sc_ah, ds, mrr.rate1, mrr.retries1,
mrr.rate2, mrr.retries2,
@ -12,8 +12,8 @@ Index: madwifi-trunk-r3314/ath/if_ath.c
#ifndef ATH_SUPERG_FF
Index: madwifi-trunk-r3314/ath/if_athvar.h
===================================================================
--- madwifi-trunk-r3314.orig/ath/if_athvar.h 2008-04-21 00:50:13.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_athvar.h 2008-04-21 03:31:48.000000000 +0200
--- madwifi-trunk-r3314.orig/ath/if_athvar.h 2008-04-21 09:13:19.000000000 +0200
+++ madwifi-trunk-r3314/ath/if_athvar.h 2008-04-23 01:15:49.000000000 +0200
@@ -446,6 +446,7 @@
u_int16_t bf_flags; /* tx descriptor flags */
u_int64_t bf_tsf;
@ -24,18 +24,30 @@ Index: madwifi-trunk-r3314/ath/if_athvar.h
* multiple segments.
Index: madwifi-trunk-r3314/ath_rate/minstrel/minstrel.c
===================================================================
--- madwifi-trunk-r3314.orig/ath_rate/minstrel/minstrel.c 2008-04-21 02:50:31.000000000 +0200
+++ madwifi-trunk-r3314/ath_rate/minstrel/minstrel.c 2008-04-21 04:08:36.000000000 +0200
@@ -336,7 +336,7 @@
--- madwifi-trunk-r3314.orig/ath_rate/minstrel/minstrel.c 2008-04-21 09:13:19.000000000 +0200
+++ madwifi-trunk-r3314/ath_rate/minstrel/minstrel.c 2008-04-23 01:15:50.000000000 +0200
@@ -333,15 +333,19 @@
if (sn->static_rate_ndx >= 0) {
ndx = sn->static_rate_ndx;
} else {
+ int delta;
sn->packet_count++;
sn->random_n = (sn->a * sn->random_n) + sn->b;
offset = sn->random_n & 0xf;
- if ((((100 * sn->sample_count) / (sn->sample_count + sn->packet_count)) < ath_lookaround_rate) && (offset < 2)) {
+ if ((((100 * sn->sample_count) / (sn->packet_count ?: 1)) < ath_lookaround_rate) && (offset < 2)) {
+ delta = (sn->packet_count * ath_lookaround_rate / 100) - sn->sample_count;
+ if ((delta > 0) && (offset < 2)) {
sn->sample_count++;
sn->is_sampling = 1;
if (sn->packet_count >= 10000) {
@@ -398,11 +398,14 @@
sn->sample_count = 0;
sn->packet_count = 0;
+ } else if (delta > sn->num_rates * 2) {
+ sn->sample_count += ((delta - sn->num_rates * 2) * ath_lookaround_rate) / 100;
}
/* Don't look for slowest rate (i.e. slowest
@@ -398,11 +402,14 @@
if (sn->num_rates <= 0)
return;
@ -52,7 +64,7 @@ Index: madwifi-trunk-r3314/ath_rate/minstrel/minstrel.c
rc1 = sn->max_tp_rate;
} else {
rc1 = sn->max_tp_rate2;
@@ -525,6 +528,9 @@
@@ -525,6 +532,9 @@
if (tries <= tries1)
return;
@ -64,8 +76,8 @@ Index: madwifi-trunk-r3314/ath_rate/minstrel/minstrel.c
tries = tries - tries1;
Index: madwifi-trunk-r3314/net80211/ieee80211_rate.h
===================================================================
--- madwifi-trunk-r3314.orig/net80211/ieee80211_rate.h 2008-01-31 03:29:42.000000000 +0100
+++ madwifi-trunk-r3314/net80211/ieee80211_rate.h 2008-04-21 03:30:25.000000000 +0200
--- madwifi-trunk-r3314.orig/net80211/ieee80211_rate.h 2008-04-21 09:11:19.000000000 +0200
+++ madwifi-trunk-r3314/net80211/ieee80211_rate.h 2008-04-21 09:13:19.000000000 +0200
@@ -87,6 +87,7 @@
int retries2;
int rate3;