From: Johannes Berg <johannes@sipsolutions.net>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"Arend Van Spriel" <arend.vanspriel@broadcom.com>,
"Felix Fietkau" <nbd@nbd.name>,
linux-wireless@vger.kernel.org,
"Eric Dumazet" <eric.dumazet@gmail.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH 5/5] mac80211: set NETIF_F_LLTX when using intermediate tx queues
Date: Thu, 25 Apr 2019 10:49:42 +0200 [thread overview]
Message-ID: <bf9053f2675959f966453b999b71f9446ad8eba2.camel@sipsolutions.net> (raw)
In-Reply-To: <20190425084428.poni4y7mqox5up5t@gondor.apana.org.au>
On Thu, 2019-04-25 at 16:44 +0800, Herbert Xu wrote:
> On Thu, Apr 25, 2019 at 10:39:52AM +0200, Johannes Berg wrote:
> >
> > Yes, that's what I meant, it can only ever return NET_XMIT_SUCCESS or
> > NET_XMIT_CN. This will not trigger the code you mentioned before though.
>
> You are right that it does not. However, the fact that this
> congestion indication is lost is a bug rather than a feature.
You can argue that way, I guess.
However, *any* queue management algorithm that doesn't *solely* employ
tail drops will necessarily behave this way.
I would argue that you get better queue management if you don't solely
rely on tail drops, so I'd rather pick better queue management than this
(relatively obscure) congestion notification. The more commonly relevant
socket buffer size will work for both.
johannes
next prev parent reply other threads:[~2019-04-25 8:49 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-16 17:06 [PATCH 1/5] mac80211: mesh: drop redundant rcu_read_lock/unlock calls Felix Fietkau
2019-03-16 17:06 ` [PATCH 2/5] mac80211: fix memory accounting with A-MSDU aggregation Felix Fietkau
2019-03-16 18:12 ` Toke Høiland-Jørgensen
2019-03-16 17:06 ` [PATCH 3/5] mac80211: calculate hash for fq without holding fq->lock in itxq enqueue Felix Fietkau
2019-03-16 18:13 ` Toke Høiland-Jørgensen
2019-03-16 17:06 ` [PATCH 4/5] mac80211: run late dequeue late tx handlers without holding fq->lock Felix Fietkau
2019-03-16 18:13 ` Toke Høiland-Jørgensen
2022-12-05 9:46 ` Wen Gong
2022-12-07 6:30 ` Wen Gong
2022-12-12 8:31 ` Wen Gong
2019-03-16 17:06 ` [PATCH 5/5] mac80211: set NETIF_F_LLTX when using intermediate tx queues Felix Fietkau
2019-03-16 18:14 ` Toke Høiland-Jørgensen
2019-04-14 9:44 ` Arend Van Spriel
2019-04-14 11:19 ` Felix Fietkau
2019-04-14 12:34 ` Arend Van Spriel
2019-04-16 7:34 ` Arend Van Spriel
2019-04-16 7:44 ` Herbert Xu
2019-04-16 8:04 ` Arend Van Spriel
2019-04-16 8:36 ` Herbert Xu
2019-04-16 8:37 ` Johannes Berg
2019-04-16 9:17 ` Arend Van Spriel
2019-04-16 9:29 ` Herbert Xu
2019-04-16 9:33 ` Toke Høiland-Jørgensen
2019-04-16 9:33 ` Johannes Berg
2019-04-16 9:37 ` Herbert Xu
2019-04-16 9:39 ` Johannes Berg
2019-04-16 10:02 ` Toke Høiland-Jørgensen
2019-04-17 2:11 ` Herbert Xu
2019-04-17 8:28 ` Toke Høiland-Jørgensen
2019-04-16 13:13 ` Herbert Xu
2019-04-16 13:18 ` Toke Høiland-Jørgensen
2019-04-17 3:38 ` Herbert Xu
2019-04-17 9:09 ` Toke Høiland-Jørgensen
2019-04-17 9:16 ` Arend Van Spriel
2019-04-17 9:17 ` Toke Høiland-Jørgensen
2019-04-23 12:41 ` Johannes Berg
2019-04-25 8:35 ` Herbert Xu
2019-04-25 8:39 ` Johannes Berg
2019-04-25 8:44 ` Herbert Xu
2019-04-25 8:49 ` Johannes Berg [this message]
2019-04-16 19:13 ` Johannes Berg
2019-04-17 2:13 ` Herbert Xu
2019-04-16 9:38 ` Toke Høiland-Jørgensen
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