From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>
To: Johannes Berg <johannes@sipsolutions.net>,
        linux-wireless@vger.kernel.org,
        make-wifi-fast@lists.bufferbloat.net
Cc: Rajkumar Manoharan <rmanohar@codeaurora.org>,
        Felix Fietkau <nbd@nbd.name>
Subject: Re: [PATCH RFC v3 1/4] mac80211: Add TXQ scheduling API
In-Reply-To: <1536583587.3224.71.camel@sipsolutions.net>
References: <153635803319.14170.10011969968767927187.stgit@alrua-x1> <153635897010.14170.2992498632345986102.stgit@alrua-x1> <1536565717.3224.12.camel@sipsolutions.net> <87musplivy.fsf@toke.dk> <1536577419.3224.50.camel@sipsolutions.net> <87zhwpjzme.fsf@toke.dk> <1536583587.3224.71.camel@sipsolutions.net>
Date: Mon, 10 Sep 2018 15:08:56 +0200
Message-ID: <87wortjy8n.fsf@toke.dk> (sfid-20180910_150900_980206_A300CCD3)
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Sender: linux-wireless-owner@vger.kernel.org

Johannes Berg <johannes@sipsolutions.net> writes:

> On Mon, 2018-09-10 at 14:39 +0200, Toke H=C3=B8iland-J=C3=B8rgensen wrote:
>
>> > From then on, right now we basically just try to refill the hardware
>> > queue from the TXQ whenever the hardware releases frames from that
>> > queue. If there are none, we fall back to putting them on the hardware
>> > queue from the wake signal.
>>=20
>> OK. So if the TXQ is ineligible to dequeue packets, but still have them
>> queued, there would need to be a signal (such as wake_txq()) when it
>> becomes eligible again, right?
>
> Right. It wouldn't have to be wake_txq, but that seems as appropriate as
> anything else.
>
> If we were to use ieee80211_airtime_may_transmit(), we'd have to have
> something that tells us "I previously told you it may not transmit, but
> now I changed my mind" :-)

Yes, exactly. Hmm, I'll see what I can come up with :)

-Toke