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mac80211: minstrel_ht: fix rounding error in throughput calculation

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On lower data rates, the throughput calculation has a significant rounding
error, causing rates like 48M and 54M OFDM to share the same throughput
value with >= 90% success probablity.

This is because the result of the division (prob_avg * 1000) / nsecs
is really small (8 in this example).

Improve accuracy by moving over some zeroes, making better use of the full
range of u32 before the division.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20210115120242.89616-10-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2021-01-15 13:02:42 +01:00 committed by Johannes Berg
parent 7e2123abc5
commit 347c2989a8
1 changed files with 3 additions and 4 deletions
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7
net/mac80211/rc80211_minstrel_ht.c
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@ -445,10 +445,9 @@ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
* (prob is scaled - see MINSTREL_FRAC above)
*/
if (prob_avg > MINSTREL_FRAC(90, 100))
return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000)
/ nsecs));
else
return MINSTREL_TRUNC(100000 * ((prob_avg * 1000) / nsecs));
prob_avg = MINSTREL_FRAC(90, 100);
return MINSTREL_TRUNC(100 * ((prob_avg * 1000000) / nsecs));
}
/*