[Cerowrt-devel] Wireless failures 3.10.17-3

[Jim Gettys]

Yes, those are the error messages I saw in my log.

It is wonderful you seem to be able to trigger them at will.
                        - Jim



On Wed, Dec 11, 2013 at 3:41 PM, Sebastian Moeller <moeller0 at gmx.de> wrote:

> Hi List, hi Dave,
>
>
> On Dec 11, 2013, at 19:41 , Dave Taht <dave.taht at gmail.com> wrote:
>
> > I have the regrettable problem of mostly testing the 5ghz channel due
> > to interference issues on the 2ghz band.
> >
> > What I am seeing in the last several releases of the 3.8.x and 3.10
> > series is after tons of traffic and multiple days of uptime a DMA tx
> > error which you can see via the logread or dmesg tool, and once it
> > happens, at least sometimes, that radio can "go away" and not be
> > resettable. "cannot stop tx dma" is the error.
>
>         I think I can make tho error appear "at will" by running
> netperf-wrapper against my wndr3700v2, just tested under 3.10.21-1:
> /netperf-wrapper -l 300 -H gw.home.lan rrul -p all -t
> hms-beagle_cerowrt3.10.21-1_2_nacktmulle
>
> dmesg on the router:
> [   53.007812] IPv6: ADDRCONF(NETDEV_CHANGE): gw11: link becomes ready
> [28792.039062] ath: phy1: Failed to stop TX DMA, queues=0x00e!
> [28794.078125] ath: phy1: Failed to stop TX DMA, queues=0x00e!
> [28807.164062] ath: phy1: Failed to stop TX DMA, queues=0x00e!
> [28809.191406] ath: phy1: Failed to stop TX DMA, queues=0x002!
> [28823.269531] ath: phy1: Failed to stop TX DMA, queues=0x00e!
>
> dmesg was clean before so these 5 failures are from the rrul test over the
> 5GHz radio
>
> running the same over the 2.4GHz radio adds the following:
>
> [29200.921875] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29206.980468] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29209.019531] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29211.066406] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29215.109375] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29227.195312] ath: phy0: Failed to stop TX DMA, queues=0x006!
> [29233.257812] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29238.308593] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29240.351562] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29247.417968] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29251.480468] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29253.515625] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29256.558593] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29262.617187] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29264.652343] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29269.699218] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29273.750000] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29278.804687] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29281.859375] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29291.933593] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29294.972656] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29304.050781] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29312.117187] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29315.167968] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29322.246093] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29325.292968] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29330.355468] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29332.390625] ath: phy0: Failed to stop TX DMA, queues=0x00a!
> [29334.445312] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29336.484375] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29337.527343] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29343.617187] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29349.679687] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29358.757812] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29361.816406] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29363.851562] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29364.882812] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29370.937500] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29371.976562] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29376.031250] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29378.062500] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29381.105468] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29388.175781] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29393.230468] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29401.292968] ath: phy0: Failed to stop TX DMA, queues=0x003!
> [29403.332031] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29413.429687] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29417.480468] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29422.542968] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29424.582031] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29427.636718] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29429.671875] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29431.718750] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29433.765625] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29445.835937] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29449.898437] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29454.960937] ath: phy0: Failed to stop TX DMA, queues=0x00f!
> [29461.023437] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29463.062500] ath: phy0: Failed to stop TX DMA, queues=0x00e!
> [29466.117187] ath: phy0: Failed to stop TX DMA, queues=0x00f!
>
> I have to admit before today I never tested with 2.4GHz and only say the 4
> to 5 messages in the 5GHz band.
>
> Running the same over the wired interface does not cause these messages…
>
> And running from a 5GHz client through the router to a wired client (both
> on the internal side) just adds:
> [30643.500000] ath: phy1: Failed to stop TX DMA, queues=0x00c!
> [30736.898437] ath: phy1: Failed to stop TX DMA, queues=0x00e!
>
> It does not immediately lead to a drop of the radio though...
>
> Maybe this can be helpful in the hands of a real expert?
>
>
> > I have seen this error
> > many, many times in cerowrt releases for the last 2 years, but this
> > time it seems more severe than usual.
> >
> > There was also a bug in dnsmasq or somewhere in the lower level of the
> > stack where it stops responding to multicast dhcp packets.
> >
> > The upcoming 3.10.23-1 development release has a refresh of mac80211,
> > and a bug fix related to multicast, so I have some hope for it.
> >
> > It has also the latest dnsmasq 2.68 (which fixes a bug in cname
> > handling in particular), and also pie v3 but I am (as usual) not in a
> > position to test it right now.
> >
> > It is my hope that now that the bug happens a lot we can track it
> > down. Or, that it's fixed. :)
> >
> > I just put that release up at:
> >
> > http://snapon.lab.bufferbloat.net/~cero2/cerowrt/wndr/3.10.23-1/
> >
> > It does not have the updated aqm-scripts code and gui (sorry
> > sebastian),
>
>         Ah, even better, I finished the discussed cosmetic changes and
> tested them, I will try to send them before Sunday, so they might end up in
> the next cero release. That means you will have to integrate with your
> changes to avoid HTB for high bandwidths… (or you just put your version in
> and I will do the integration after the next release :) )
>         Also, I still need to figure out how to make mutually exclusive
> with the default QOS system...
>
>
> > nor the pie v4 drop that just got rejected for kernel
> > mainline. I'll try to do a respin this weekend with those, and poke
> > harder at the dma tx issue after I get back in the lab. Thoughts
> > towards being able to isolate the cause and minimize the effect are
> > welcomed - it's one of the biggest barriers to declaring a stable
> > release at this point!
> >
> >
> > On Wed, Dec 11, 2013 at 8:58 AM, Stephen Hemminger
> > <stephen at networkplumber.org> wrote:
> >> Has anyone seen wireless failing after several days with 3.10.17-3?
> >>
> >> The symptoms are devices fall off the net several days (or a week) after
> >> router has been running. I saw the bg AP go away, but the 5 Ghz AP still
> >> working. Wired attachment works.
> >> _______________________________________________
> >> Cerowrt-devel mailing list
> >> Cerowrt-devel at lists.bufferbloat.net
> >> https://lists.bufferbloat.net/listinfo/cerowrt-devel
> >
> >
> >
> > --
> > Dave Täht
> >
> > Fixing bufferbloat with cerowrt:
> http://www.teklibre.com/cerowrt/subscribe.html
> > _______________________________________________
> > Cerowrt-devel mailing list
> > Cerowrt-devel at lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/cerowrt-devel
>
> _______________________________________________
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