Hi everyone,
while I might be totally wrong with my observation, I still would like
to share it, because this issue is lingering for years now and many
users are waiting to a solid grip on it to fix it.
I'm running several freifunk-nodes in Cologne, Germany, where the
firmware contains a ath9k-watchdog that restarts the node, once the
failure occurs. One of my nodes is affected in varying intervals of 200
.. 10000 seconds uptime, depending on WLAN activity.
(openwrt, attitude adjustment, kernel 3.3.8)
Looking at "/sys/kernel/debug/ieee80211/phy0/ath9k/xmit", it seems that
MPDUs in the highest priority queue "VO" have a lower rate of
"completion" (90,5%) than those in "BE" (>99,9%).
From my laymen's perspective I would expect "VO" to have an even better
completion rate than "BE".
Any chance to see a correlation between WMM priority queue handling and
DMA access problems?
Regards,
Rougu
root@64700284ede8:~# uptime
09:52:13 up 14:33, load average: 0.00, 0.01, 0.04
root@64700284ede8:~# cat /sys/kernel/debug/ieee80211/phy0/ath9k/xmit
Num-Tx-Queues: 10 tx-queues-setup: 0x10f poll-work-seen: 52392
BE BK VI VO
MPDUs Queued: 1349013 22 0 8497
MPDUs Completed: 1348756 22 0 7694
MPDUs XRetried: 257 0 0 803
Aggregates: 116 13 0 0
AMPDUs Queued HW: 2448 316 0 0
AMPDUs Queued SW: 364 72 0 0
AMPDUs Completed: 2767 388 0 0
AMPDUs Retried: 281 24 0 0
AMPDUs XRetried: 44 0 0 0
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
TX-Pkts-All: 1351824 410 0 8497
TX-Bytes-All: 184784983 454112 0 1280336
hw-put-tx-buf: 1 1 0 2
hw-tx-start: 1351887 376 0 8497
hw-tx-proc-desc: 1351887 376 0 8497
TX-Failed: 0 0 0 0
txq-memory-address: 81b7a1b4 81b7a230 81b7a138 81b7a0bc
axq-qnum: 2 3 1 0
axq-depth: 0 0 0 0
axq-ampdu_depth: 0 0 0 0
axq-stopped 0 0 0 0
tx-in-progress 0 0 0 0
pending-frames 0 0 0 0
txq_headidx: 0 0 0 0
txq_tailidx: 0 0 0 0
axq_q empty: 0 0 1 0
axq_acq empty: 1 1 1 1
txq_fifo[0] empty: 1 1 1 1
txq_fifo[1] empty: 1 1 1 1
txq_fifo[2] empty: 1 1 1 1
txq_fifo[3] empty: 1 1 1 1
txq_fifo[4] empty: 1 1 1 1
txq_fifo[5] empty: 1 1 1 1
txq_fifo[6] empty: 1 1 1 1
txq_fifo[7] empty: 1 1 1 1
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