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

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Date:	Thu, 17 Mar 2016 10:03:45 +0100
From:	Michal Kazior <michal.kazior@...to.com>
To:	Dave Taht <dave.taht@...il.com>
Cc:	linux-wireless <linux-wireless@...r.kernel.org>,
	"ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
	Johannes Berg <johannes@...solutions.net>,
	Network Development <netdev@...r.kernel.org>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	Tim Shepard <shep@...m.mit.edu>,
	make-wifi-fast@...ts.bufferbloat.net,
	"codel@...ts.bufferbloat.net" <codel@...ts.bufferbloat.net>
Subject: Re: [RFCv2 0/3] mac80211: implement fq codel

On 16 March 2016 at 16:37, 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.

Sorry. I'm still trying to figure out what variables are worth
considering for comparison purposes.


> 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".

I'm using 2.6 straight out of debian repos so yeah. I guess I'll try
using more recent netperf if I can't figure out the hiccups.


Michał


> 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