[Cerowrt-devel] cerowrt-3.10.44-6 released

R. redag2 at gmail.com
Sun Jul 6 15:45:55 EDT 2014

All of my devices are connected on the 2.4 Ghz AP of a WNDR3800
running 3.10.44-6.

Here's my feedback:

+ WiFi stability has improved in the sense that the AP no longer disappears.

- Latency spikes still exist. Huge latency lag comes in for up to a
minute (can be seen in ping stats). It usually fixes itself within the
- Net connectivity can go out for up to a minute on all devices. It
usually fixes itself within the minute.
- "Failed to stop TX DMA, queues=0x004!" still occuring. Had 23
instances in the last 9 hours.
- New warning appears multiple time in logs: "daemon.warn
avahi-daemon[2154]: server.c: Packet too short or invalid while
reading known answer record. (Maybe a UTF-8 problem?)"

Overall, fairly satisfied.

On Thu, Jun 26, 2014 at 3:53 PM, Dave Taht <dave.taht at gmail.com> wrote:
> I have been blowing it up with continuous traffic, saturating the cpu,
> talking to multiple devices, using crypto and ethernet, now for
> several days.
> I am using sfq on the wifi, rather than fq_codel, at least temporarily.
> Occasionally, using the rrul test, I can get it to temporarily either
> lose a route or  deassociate from wifi, or something else like netperf
> itself blowing up, but it always comes back within a few seconds. So
> far, using the rrul_be test I haven't seen that happen. I do see cpu
> absolutely maxed at present with rrul and not rrul_be.
> I have given up on tuning the wifi aggregate queue length (formerly
> 12, now 48) as much as I had before - as the previous setting had
> adverse effects on download throughput, so I'll put that fix in the
> next release and live with the added latency until we can pull
> together the make-wifi-fast project.
> I see an improvement on the simultaneous upload/download test from
> 10mbit up/.2 down to 6up,3down, latency (as measured on the main
> client) of about 80ms (which still sucks about 10x worse than what
> seems possible)
> I ran out of space on my packet captures...
> I am going to be adding more clients, switching back to fq_codel, and
> adding in ipv6 if this continues to take the load I am throwing at it.
> Then adding impairments to degrade the wifi to more marginal levels.
> Interestingly I have not got any instruction traps, nor the famed dma
> overrun bug/recovery in this release so far... I am encouraged, but
> until I setup a mac  with bad connectivity and have things run for
> days and days I won't sleep well.
> And I had done a build from this codebase for the picostation and am
> watching that crash under normal load regularly. That box only has
> 32MB of memory, where the cerowrt box has 128MB memory.
> On Thu, Jun 26, 2014 at 12:28 PM, Jim Reisert AD1C
> <jjreisert at alum.mit.edu> wrote:
>> Been running since Wednesday evening, no issues so far.
>> --
>> Jim Reisert AD1C, <jjreisert at alum.mit.edu>, http://www.ad1c.us
> --
> Dave Täht
> NSFW: https://w2.eff.org/Censorship/Internet_censorship_bills/russell_0296_indecent.article
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