From: Pete Heist <pete@eventide.io>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: make-wifi-fast@lists.bufferbloat.net
Subject: Re: [Make-wifi-fast] mesh deployment with ath9k driver changes
Date: Tue, 24 Apr 2018 16:09:32 +0200 [thread overview]
Message-ID: <1BA3CECA-8C05-4E94-9E2A-1AEA3C2F20B3@eventide.io> (raw)
In-Reply-To: <87po2o7lwb.fsf@toke.dk>
> On Apr 24, 2018, at 3:51 PM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
>
> Assuming you have debugfs enabled you should be able to get aggregate
> statistics from /sys/kernel/debug/ieee80211/phy0/ath9k/xmit - at least
> that contains retries, but not backoff data, unfortunately.
If it’s the ratio of "AMPDUs Completed” to "AMPDUs Retried” or “AMPDUs XRetried” we’re looking at, there’s a stark difference between Cabin 12 and Cabin 28. That said, they have quite different traffic patterns, so I’ll have to evaluate this in a situation where traffic patterns are more similar...
Cabin 12 (worst, two repeaters on gateway, NLOS):
# cat /sys/kernel/debug/ieee80211/phy0/ath9k/xmit
BE BK VI VO
MPDUs Queued: 23330 735 112 304318
MPDUs Completed: 2096742 1468 144 6622260
MPDUs XRetried: 11932 509 74 274653
Aggregates: 1548313 31541 499 0
AMPDUs Queued HW: 0 0 0 0
AMPDUs Completed: 9674195 204610 22667 0
AMPDUs Retried: 1298897 22613 1025 0
AMPDUs XRetried: 45898 1189 120 0
TXERR Filtered: 7893 96 7 4
FIFO Underrun: 3 0 0 60
TXOP Exceeded: 0 0 0 0
TXTIMER Expiry: 0 0 0 0
DESC CFG Error: 0 0 0 0
DATA Underrun: 1 0 0 0
DELIM Underrun: 1 0 0 0
TX-Pkts-All: 11828767 207776 23005 6896913
TX-Bytes-All: 4193674267 197040003 23478961787460234
HW-put-tx-buf: 5318127 133067 23506 6395453
HW-tx-start: 0 0 0 0
HW-tx-proc-desc: 5690166 132905 23507 6891740
TX-Failed: 0 0 0 0
Cabin 28 (best, one repeater on gateway, LOS):
# cat /sys/kernel/debug/ieee80211/phy0/ath9k/xmit
BE BK VI VO
MPDUs Queued: 23164 335 2 6929001
MPDUs Completed: 3218272 782 50 9311052
MPDUs XRetried: 6036 250 2 1821270
Aggregates: 6427093 20892 12 0
AMPDUs Queued HW: 0 0 0 0
AMPDUs Completed: 100430860 189959 375988 0
AMPDUs Retried: 1112896 8011 27 0
AMPDUs XRetried: 33862 449 2 0
TXERR Filtered: 2428 122 0 37
FIFO Underrun: 0 0 0 2
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: 103689030 191440 376042 11132322
TX-Bytes-All: 2783223251 210905451 601627081919930466
HW-put-tx-buf: 16245494 109264 376059 10911913
HW-tx-start: 0 0 0 0
HW-tx-proc-desc: 16282116 109333 376056 11131555
TX-Failed: 0 0 0 0
>> I wish I could cable everything, but it isn’t physically practical.
>> The next possibility is dual channel APs, or separate backhaul links,
>> all costing something...
>
> Yeah, a separate backhaul on a different channel would cut you
> contention in half, basically. Right now, each transmission has to
> occupy the channel twice...
Could that cause mean RTT to go up 10x? :) In combination with having two repeaters on one gateway…
next prev parent reply other threads:[~2018-04-24 14:09 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-24 8:33 Pete Heist
2018-04-24 11:54 ` Toke Høiland-Jørgensen
2018-04-24 13:37 ` Pete Heist
2018-04-24 13:51 ` Toke Høiland-Jørgensen
2018-04-24 14:09 ` Pete Heist [this message]
2018-04-24 14:34 ` Toke Høiland-Jørgensen
2018-04-24 19:10 ` Pete Heist
2018-04-24 21:32 ` Toke Høiland-Jørgensen
2018-04-25 6:05 ` Pete Heist
2018-04-25 6:36 ` Sebastian Moeller
2018-04-25 17:17 ` Pete Heist
2018-04-26 0:41 ` David Lang
2018-04-26 19:40 ` Pete Heist
2018-04-26 0:38 ` David Lang
2018-04-26 21:41 ` Pete Heist
2018-04-26 21:44 ` Sebastian Moeller
2018-04-26 21:56 ` Pete Heist
2018-04-26 22:04 ` David Lang
2018-04-26 22:47 ` Pete Heist
2018-04-27 10:15 ` Toke Høiland-Jørgensen
2018-04-27 10:32 ` Pete Heist
2018-04-26 0:35 ` David Lang
2018-04-27 11:42 ` Valent Turkovic
2018-04-27 11:50 ` Pete Heist
2018-04-27 11:59 ` Valent Turkovic
2018-04-27 12:17 ` Pete Heist
2018-04-27 11:47 ` Valent Turkovic
2018-04-27 12:00 ` Pete Heist
2018-05-19 16:03 bkil
2018-05-20 18:56 ` Pete Heist
2018-05-31 0:52 ` David Lang
2018-06-08 9:37 ` Pete Heist
2018-06-09 15:32 ` bkil
2018-06-13 13:07 ` Pete Heist
2018-06-13 13:24 ` Toke Høiland-Jørgensen
2018-06-13 16:01 ` Pete Heist
2018-06-30 19:14 ` bkil
2018-07-04 21:47 ` Pete Heist
2018-07-05 13:08 ` Toke Høiland-Jørgensen
2018-07-05 17:26 ` Pete Heist
2018-07-05 17:37 ` Toke Høiland-Jørgensen
2018-07-05 18:02 ` Pete Heist
2018-07-05 20:17 ` Jonathan Morton
2018-07-09 2:20 ` Aaron Wood
2018-07-09 5:17 ` Jonathan Morton
2018-07-09 6:27 ` Pete Heist
2018-07-09 12:55 ` Sebastian Moeller
2018-07-09 23:21 ` Pete Heist
2018-07-09 5:13 ` David Lang
2018-07-09 23:33 ` Pete Heist
2018-07-10 0:39 ` Pete Heist
2018-07-10 7:02 ` bkil
2018-06-13 16:30 ` Sebastian Moeller
2018-06-13 17:50 ` Toke Høiland-Jørgensen
[not found] ` <CADuVhRWL2aVjzjfLHg1nPFa8Ae-hWrGrE7Wga4eUKon3oqoTXA@mail.gmail.com>
2018-06-30 19:26 ` bkil
2018-06-30 20:04 ` Jannie Hanekom
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