netdev - Re: [PATCH 5/5] mac80211: set NETIF_F_LLTX when using intermediate tx queues

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Message-ID: <20190416093707.dtlwcmitzqopaeaw@gondor.apana.org.au>
Date:   Tue, 16 Apr 2019 17:37:08 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Felix Fietkau <nbd@....name>, linux-wireless@...r.kernel.org,
        Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] mac80211: set NETIF_F_LLTX when using intermediate
 tx queues

On Tue, Apr 16, 2019 at 11:33:50AM +0200, Johannes Berg wrote:
> On Tue, 2019-04-16 at 10:33 +0100, Toke Høiland-Jørgensen wrote:
> > 
> > > It is true because we have an entire buffering layer in mac80211 (in
> > > this case at least) and never push back to the stack.
> > 
> > I'm wondering if we should be?
> 
> I don't think so? We'd just buffer packets in yet another place.

But you do realise that you're giving up on the rich queueing
functionality that Linux provides (net/sched), not to mention
breaking certain applications that rely on congestion feedback?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt