[Cake] linksys ac1200 network bug
dave.taht at gmail.com
Sun Nov 29 06:18:50 EST 2015
On Sat, Nov 28, 2015 at 10:19 PM, Imre Kaloz <kaloz at openwrt.org> wrote:
> Did you see https://lkml.org/lkml/2015/11/27/325 ? I'll try to find time to
> integrate a newer kernel and that patchset as well as
> https://lkml.org/lkml/2015/11/22/9 ,
> http://lkml.iu.edu/hypermail/linux/kernel/1511.0/04354.html and
Nope, missed those. Thx!
At one level I hate it when I test something that is out of date, but
losing a day of testing to only being a day out of date, is
particularly annoying. :(
As I noted, I'm in love with those routing cache lookup fixes in
4.x.... I have a (bad) patch for BQL for this driver too that could
probably be fixed unless it landed already? (I am not sure how you do
xmit_more without BQL)
I will go back to testing on 4.1 on the archer for a while. The steps
to reproduce the bug I saw is merely try running two or more copies of
netperf to the router.
> On Sat, 28 Nov 2015 15:41:17 +0100, Dave Taht <dave.taht at gmail.com> wrote:
>> I went for a test drive of openwrt DESIGNATED DRIVER (Bleeding Edge,
>> r47665) today.
>> A) I bricked the archer c7 v2. No idea why.
>> B) I got a sorta working linksys 1200ac build.
>> The bad news: Any attempt to run 2 or more copies of netperf's
>> netserver on the 1200ac router with the default qdiscs (mq +
>> fq_codel), at line (gbit) rate, result in it locking up *for any other
>> traffic, including ping* until the first netperf is more or less
>> complete. I fear the underlying driver is frightfully overbuffered,
>> or has another problem.
>> (needs BQL, too)
>> The still bad news: cake works in both directions for a while longer,
>> then goes boom similarly.
>> The somewhat good news:
>> cake "shaped" to 900mbit on inbound and outbound to the router - does
>> not lock up the router. It merely runs out of cpu, but still does
>> manage quite respectable throughput in both directions while doing
>> so. Note, I did not say "latency".
>> As usual there is some flent data in that dir if you want to draw your
>> own plots.
>> I was not in a position to actually test traffic through the router
>> (because I had the archer setup to do that)
>> I wouldn't draw any conclusions from this. Well, a safe conclusion,
>> is: don't install this build.
>> On Sat, Nov 28, 2015 at 11:41 AM, Dave Taht <dave.taht at gmail.com> wrote:
>>> Trying to do my first openwrt build in a while.
>>> make: Leaving directory
>>> Makefile:349: recipe for target 'all' failed
>>> I checked: the package "dante" is not installed. Nor can I figure out
>>> what package is arbitrarily requiring it.
>>> I truly am in hell.
>> Simple patch for this, It involves invoking a deity.
>>> Dave Täht
>>> Let's go make home routers and wifi faster! With better software!
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