2010/7/26 Felix Fietkau <nbd@xxxxxxxxxxx>:
> On 2010-07-26 9:23 PM, Björn Smedman wrote:
>> 2010/7/26 Felix Fietkau <nbd@xxxxxxxxxxx>:
>> * When tx is aggregated most rate control probe frames end up inside
>> aggregates and are never used for probing (effective probe frequency
>> is divided by average aggregate length).
> Nope, a probing frame never ends up inside an aggregate. It's always
> sent out as a single frame, which is why I had to make the decision
> about sending a probing frame more complex in minstrel_ht, compared to
> minstrel - the previous 10% stuff was limiting aggregation size.
Ok, I must have jumped to conclusions. I looked quickly at the code
and had the impression that it only cared about the RATE_PROBE flag if
it was on the first subframe of the aggregate, and then I compared
debug output from rc and xmit like this:
root@OpenWrt:/sys/kernel/debug# cat
ieee80211/phy0/stations/00\:1e\:52\:c7\:cf\:63/rc_stats ; ca
t ath9k/phy0/xmit
type rate throughput ewma prob this prob this
succ/attempt success attempts
HT20/LGI MCS0 5.8 87.3 50.0 0( 0)
48 54
HT20/LGI MCS1 12.6 94.6 100.0 0( 0)
46 48
HT20/LGI MCS2 18.9 95.8 100.0 0( 0)
52 73
HT20/LGI MCS3 24.8 94.8 100.0 0( 0)
53 62
HT20/LGI MCS4 38.4 99.2 100.0 0( 0)
45 55
HT20/LGI MCS5 47.4 94.0 100.0 0( 0)
56 72
HT20/LGI MCS6 55.4 98.7 100.0 0( 0)
60 78
HT20/LGI PMCS7 56.2 88.8 66.6 0( 0)
112 143
HT20/LGI MCS8 10.8 81.4 50.0 0( 0)
50 62
HT20/LGI MCS9 23.6 90.4 100.0 0( 0)
66 81
HT20/LGI MCS10 30.6 79.0 50.0 0( 0)
51 64
HT20/LGI MCS11 50.1 99.2 100.0 0( 0)
56 63
HT20/LGI MCS12 60.1 80.6 100.0 0( 0)
217 382
HT20/LGI MCS13 66.6 70.6 50.0 0( 0)
2440 3042
HT20/LGI t MCS14 82.9 77.9 65.9 0( 0)
70446 86949
HT20/LGI T MCS15 85.5 73.5 77.1 264(342)
31170 43240
Total packet count:: ideal 117093 lookaround 1322
Average A-MPDU length: 10.6
BE BK VI VO
MPDUs Queued: 120 0 0 224
MPDUs Completed: 120 0 0 224
Aggregates: 7555 0 0 0
AMPDUs Queued: 118358 0 0 50
AMPDUs Completed: 118247 0 0 20
AMPDUs Retried: 15406 0 0 300
AMPDUs XRetried: 21 0 0 30
FIFO Underrun: 0 0 0 0
TXOP Exceeded: 0 0 0 0
TXTIMER Expiry: 0 0 0 0
DESC CFG Error: 0 0 0 0
DATA Underrun: 0 0 0 0
DELIM Underrun: 0 0 0 0
Rate control says 1322 lookaround (=probe frames?) but ath9k xmit says
only 120 + 224 MPDUs.
/Björn
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