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Date: Wed, 17 Apr 2019 10:09:16 +0100 From: Toke Høiland-Jørgensen <toke@...hat.com> To: Herbert Xu <herbert@...dor.apana.org.au> Cc: Johannes Berg <johannes@...solutions.net>, 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 Herbert Xu <herbert@...dor.apana.org.au> writes: > On Tue, Apr 16, 2019 at 02:18:36PM +0100, Toke Høiland-Jørgensen wrote: >> >> > The congestion control happens at two levels. You are right that the >> > socket buffer acts as one limit. However, other applications may also >> > rely on the TX queue being full as the throttle (by setting a >> > sufficiently large socket buffer size). >> >> Do you happen to have an example of an application that does this that >> could be used for testing? :) > > Have a look at > > commit 6ce9e7b5fe3195d1ae6e3a0753d4ddcac5cd699e > Author: Eric Dumazet <eric.dumazet@...il.com> > Date: Wed Sep 2 18:05:33 2009 -0700 > > ip: Report qdisc packet drops > > You should be able to do a UDP flood while setting IP_RECVERR to > detect the packet drop due to a full queue which AFAICS will never > happen with the current mac80211 setup. Yup, got that part. Was just wondering if you know of any applications that already do this, that I could test without having to write my own... :) -Toke
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