On 02/21/2013 03:56 PM, Adrian Chadd wrote:
Right. As you increase attenuation, two things happen:
* You're going to see lots more filtered frames pop up; which may
involve pause/unpause of the queue;
* You're going to see BAR frames go out, which will involve
pausing/unpausing the queue.
So you may have found some very nice way to reproduce pause/unpause
related problems that are brought on by lots of TX failures leading to
BARs and filtered frames.
(Having your BAR frames be filtered .. god I hope not.)
So see whether there's some odd scenario where a queue is unpaused and
things aren't drained from the pending queue?
The hang I see is where the stats sit like this (below) and never change (for the first queue)
To me, the interesting part is that the BE queue is stopped while
axq-depth and axq-ampdu depth are zero. I don't fully understand
this code..but I sort of expected the depths to be non-zero when
packets were being processed by the hardware..maybe that's totally
incorrect...
It seems to hang forever once it gets stuck in this case unless
I reset the chip.
I'm not sure if it's related, but the tx rates do not drop as low
as I believe they should. These systems are using ath9k rate control,
and I plan to change that to minstrel_ht once I can get the current
config to at least recover when attenuation gets better....
[root@lf0301-demo1 ~]# cat /debug/ieee80211/wiphy0/ath9k/xmit ;sleep 10; cat /debug/ieee80211/wiphy0/ath9k/xmit ;
Num-Tx-Queues: 10 tx-queues-setup: 0x10f poll-work-seen: 1823
BE BK VI VO
MPDUs Queued: 500 0 0 4102
MPDUs Completed: 473 0 0 4102
MPDUs XRetried: 27 0 0 0
Aggregates: 200 0 0 0
AMPDUs Queued HW: 97039 0 0 0
AMPDUs Queued SW: 11299 0 0 0
AMPDUs Completed: 107982 0 0 0
AMPDUs Retried: 410 0 0 0
AMPDUs XRetried: 116 0 0 0
TXERR Filtered: 224 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: 108598 0 0 4102
TX-Bytes-All: 164436206 0 0 304838
hw-put-tx-buf: 107863 0 0 4096
hw-tx-start: 0 0 0 0
hw-tx-proc-desc: 0 0 0 0
TX-Failed: 0 0 0 0
txq-memory-address: f2b724e8 f2b725a4 f2b7242c f2b72370
axq-qnum: 2 3 1 0
axq-depth: 0 0 0 0
axq-ampdu_depth: 0 0 0 0
axq-stopped 1 0 0 0
tx-in-progress 0 0 0 0
pending-frames 123 0 0 0
txq_headidx: 7 0 0 0
txq_tailidx: 7 0 0 0
axq_q empty: 1 1 1 1
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
Num-Tx-Queues: 10 tx-queues-setup: 0x10f poll-work-seen: 1833
BE BK VI VO
MPDUs Queued: 500 0 0 4140
MPDUs Completed: 473 0 0 4140
MPDUs XRetried: 27 0 0 0
Aggregates: 200 0 0 0
AMPDUs Queued HW: 97039 0 0 0
AMPDUs Queued SW: 11299 0 0 0
AMPDUs Completed: 107982 0 0 0
AMPDUs Retried: 410 0 0 0
AMPDUs XRetried: 116 0 0 0
TXERR Filtered: 224 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: 108598 0 0 4140
TX-Bytes-All: 164436206 0 0 306788
hw-put-tx-buf: 107863 0 0 4134
hw-tx-start: 0 0 0 0
hw-tx-proc-desc: 0 0 0 0
TX-Failed: 0 0 0 0
txq-memory-address: f2b724e8 f2b725a4 f2b7242c f2b72370
axq-qnum: 2 3 1 0
axq-depth: 0 0 0 0
axq-ampdu_depth: 0 0 0 0
axq-stopped 1 0 0 0
tx-in-progress 0 0 0 0
pending-frames 123 0 0 0
txq_headidx: 7 0 0 6
txq_tailidx: 7 0 0 6
axq_q empty: 1 1 1 1
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
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
