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

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Date:	Wed, 16 Mar 2016 11:26:11 +0100
From:	Michal Kazior <michal.kazior@...to.com>
To:	linux-wireless <linux-wireless@...r.kernel.org>
Cc:	"ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
	Johannes Berg <johannes@...solutions.net>,
	Network Development <netdev@...r.kernel.org>,
	Dave Taht <dave.taht@...il.com>,
	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,
	Michal Kazior <michal.kazior@...to.com>
Subject: Re: [RFCv2 0/3] mac80211: implement fq codel

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 "fq.tar.gz" of type "application/x-gzip" (63753 bytes)