Hi Aaron,
On Jan 16, 2014, at 16:03 , Aaron Wood <[email protected]> wrote:
> All,
>
> I'm noting this here in case anyone is interested. After I write this up,
> I'm going to start from scratch on the configuration, and factory-reset the
> router.
>
> =====
>
> The 5GHz radio on my 3800 seems to be in a very odd state. I'm not quire
> sure what state it's in, but it seems to be only doing HT20 1x1. And in a
> fairly broken manner at that.
>
> Running the rrul test (over wifi directly to the router as the netserver),
> tcp uploads were 25Mbps or so, but download was 5Mbps.
This is with your mac? Try rrul_noclassification, macosx (at least
10.8) will not do RRUL fair to a fast host. Why I do not know… it always
prioritizes the upload, as if it did not see/trust the downstream markings
(heck maybe it is busy using all bandwidth for upstream so that it literally
never sees the markings on the downstream packets..)
About the other issue I do not know anything…
Best Regards
Sebastian
> This is me 1-2 meters from the router. Load was never more than 0.33. (I
> can share the results of people are interested).
>
> After a full power cycle, wifi isn't coming up at all.
>
> =====
>
> How I got here:
>
>
> I'm in France, and had dutifully set my unit with the FR country code when
> setting up CeroWRT. I had noticed some odd latencies (periodic 100-200ms
> latency every 10-20 seconds over wifi) on the 5GHz network. The router was
> on channel 36, and I wanted to move it up to the far-upper ranges, so I tried
> to specify a "custom" channel to do so (140). This was the channel I thought
> I had been using with stock (Netgear) firmware.
>
> Wifi didn't come back up after applying the changes, and the luci interface
> seemed to be tripping up over stuff that it was reading out of the
> configuration files.
>
> I ssh'd in via ethernet, and fixed up the configurations by hand.
>
> Except the driver is still reporting that the 5GHz network won't kick into
> 802.11n modes, and won't use HT40. It seems to be sure it's configured for
> it, but isn't using it.
>
> Further, digging into the rc_stats files with the minstrel speeds, I found
> some very odd data (not what I was expecting to see:
>
> (laptop, which can do 2x2 HT40)
> rate throughput ewma prob this prob this succ/attempt success
> attempts
> D 6 6.0 99.9 100.0 2( 2) 65
> 65
> 9 0.0 0.0 0.0 0( 0) 0
> 0
> 12 2.9 25.0 100.0 0( 0) 1
> 1
> 18 4.3 25.0 100.0 0( 0) 1
> 1
> 24 5.6 25.0 100.0 0( 0) 1
> 1
> A P 36 32.4 99.9 100.0 0( 0) 51
> 51
> C 48 10.4 25.0 100.0 0( 0) 1
> 1
> B 54 11.5 25.0 100.0 0( 0) 1
> 1
>
> Total packet count:: ideal 53 lookaround 7
>
> (AppleTV, 1x1 HT20)
> root@cerowrt:/sys/kernel/debug/ieee80211/phy1/netdev:sw10# cat
> stations/58\:55\:ca\:51\:b5\:4b/rc_stats
> rate throughput ewma prob this prob this succ/attempt success
> attempts
> 6 3.5 57.8 100.0 0( 0) 6
> 6
> 9 3.9 43.7 100.0 0( 0) 2
> 2
> 12 5.1 43.7 100.0 0( 0) 2
> 2
> 18 10.0 57.8 100.0 0( 0) 3
> 3
> D 24 13.1 57.8 100.0 0( 0) 3
> 3
> C 36 14.2 43.7 100.0 0( 0) 2
> 2
> B 48 18.2 43.7 100.0 0( 0) 2
> 2
> A P 54 46.2 99.9 100.0 1( 1) 348
> 367
>
> Total packet count:: ideal 331 lookaround 37
>
> Whereas what I'm seeing for the 2.4GHz radio is:
>
> root@cerowrt:/sys/kernel/debug/ieee80211/phy0/netdev:sw00/stations# cat
> 10\:9a\:dd\:30\:96\:34/rc_stats
> type rate throughput ewma prob this prob retry this
> succ/attempt success attempts
> CCK/LP 1.0M 0.7 100.0 100.0 0
> 0( 0) 2 2
> CCK/SP 2.0M 0.0 0.0 0.0 0
> 0( 0) 0 0
> CCK/SP 5.5M 0.0 0.0 0.0 0
> 0( 0) 0 0
> CCK/SP 11.0M 0.0 0.0 0.0 0
> 0( 0) 0 0
> HT20/LGI MCS0 5.6 100.0 100.0 1
> 0( 0) 2 2
> HT20/LGI MCS1 0.0 0.0 0.0 0
> 0( 0) 0 0
> HT20/LGI MCS2 0.0 0.0 0.0 0
> 0( 0) 0 0
> HT20/LGI MCS3 0.0 0.0 0.0 0
> 0( 0) 0 0
> HT20/LGI MCS4 0.0 0.0 0.0 0
> 0( 0) 0 0
> HT20/LGI MCS5 30.3 100.0 100.0 5
> 0( 0) 1 1
> HT20/LGI t MCS6 32.5 100.0 100.0 5
> 0( 0) 11 11
> HT20/LGI T P MCS7 35.0 100.0 100.0 5
> 6( 6) 34 34
>
> Total packet count:: ideal 45 lookaround 3
> Average A-MPDU length: 1.3
>
>
> And here are radio blocks from the current /etc/config/wireless:
>
> config wifi-device 'radio1'
> option type 'mac80211'
> option macaddr '28:c6:8e:bb:9a:49'
> list ht_capab 'SHORT-GI-40'
> list ht_capab 'TX-STBC'
> list ht_capab 'RX-STBC1'
> list ht_capab 'DSSS_CCK-40'
> option txpower '17'
> option distance '25'
> option channel '48'
> option country 'US'
>
> config wifi-device 'radio0'
> option type 'mac80211'
> option hwmode '11ng'
> option macaddr '28:c6:8e:bb:9a:47'
> option htmode 'HT20'
> list ht_capab 'SHORT-GI-40'
> list ht_capab 'TX-STBC'
> list ht_capab 'RX-STBC1'
> list ht_capab 'DSSS_CCK-40'
> option txpower '26'
> option country 'FR'
> option distance '15'
> option channel 'auto'
>
> ======
>
> Some notes after having repaired the situation:
>
> - The pci paths to the radios was missing from /etc/config/wireless, that's
> the only thing that I saw that seemed grossly out of place.
>
> - Back up and running, and yes, it's much happier, now. Over wifi I get
> 60-70Mbps upload and ~40Mbps download (running rrul). Latency sucks. Wifi
> has some ugly bufferbloat. (although these results are somewhat in question
> when the router has a 1m load average over 5.0...)
>
> - Enabling all the SQM features I was having previously also considerably
> cleaned up wifi performance. It's more balanced, but still not nearly as
> balanced as I see on gigabit ethernet.
>
>
>
> -Aaron
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