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

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Message-ID: <CAA93jw5cUaj_qM+CYHHoRaghLDLC+BUgF4AjT=Oec+SB-zb74g@mail.gmail.com>
Date:	Wed, 16 Mar 2016 08:37:31 -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>,
	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

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 "cdf_comparison.png" of type "image/png" (87203 bytes)