netdev - Re: [RFCv2 0/3] mac80211: implement fq codel

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Date:	Wed, 16 Mar 2016 11:36:31 -0700
From:	Dave Taht <dave.taht@...il.com>
To:	Michal Kazior <michal.kazior@...to.com>
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	"ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
	Network Development <netdev@...r.kernel.org>,
	make-wifi-fast@...ts.bufferbloat.net,
	"codel@...ts.bufferbloat.net" <codel@...ts.bufferbloat.net>
Subject: Re: [RFCv2 0/3] mac80211: implement fq codel

That is the sanest 802.11e queue behavior I have ever seen!  (at both
6 and 300mbit! in the ath10k patched mac test)

It would be good to add a flow to this test that exercises the VI
queue (CS5 diffserv marking?), and to repeat this test with wmm
disabled for comparison.


Dave Täht
Let's go make home routers and wifi faster! With better software!
https://www.gofundme.com/savewifi


On Wed, Mar 16, 2016 at 8:37 AM, Dave Taht <dave.taht@...il.com> wrote:
> it is helpful to name the test files coherently in the flent tests, in
> addition to using a directory structure and timestamp. It makes doing
> comparison plots in data->add-other-open-data-files simpler. "-t
> patched-mac-300mbps", for example.
>
> Also netperf from svn (maybe 2.7, don't remember) will restart udp_rr
> after a packet loss in 250ms. Seeing a loss on UDP_RR and it stop for
> a while is "ok".
> Dave Täht
> Let's go make home routers and wifi faster! With better software!
> https://www.gofundme.com/savewifi
>
>
> On Wed, Mar 16, 2016 at 3:26 AM, Michal Kazior <michal.kazior@...to.com> wrote:
>> On 16 March 2016 at 11:17, Michal Kazior <michal.kazior@...to.com> wrote:
>>> Hi,
>>>
>>> Most notable changes:
>> [...]
>>>  * ath10k proof-of-concept that uses the new tx
>>>    scheduling (will post results in separate
>>>    email)
>>
>> I'm attaching a bunch of tests I've done using flent. They are all
>> "burst" tests with burst-ports=1 and burst-length=2. The testing
>> topology is:
>>
>>                    AP ----> STA
>>                    AP )) (( STA
>>  [veth]--[br]--[wlan] )) (( [wlan]
>>
>> You can notice that in some tests plot data gets cut-off. There are 2
>> problems I've identified:
>>  - excess drops (not a problem with the patchset and can be seen when
>> there's no codel-in-mac or scheduling isn't used)
>>  - UDP_RR hangs (apparently QCA99X0 I have hangs for a few hundred ms
>> sometimes at times and doesn't Rx frames causing UDP_RR to stop
>> mid-way; confirmed with logs and sniffer; I haven't figured out *why*
>> exactly, could be some hw/fw quirk)
>>
>> Let me know if you have questions or comments regarding my testing/results.
>>
>>
>> Michał

Download attachment "sanest_802.11eresult_i_have_ever_seen.png" of type "image/png" (146956 bytes)