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From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: make-wifi-fast@lists.bufferbloat.net,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [Make-wifi-fast] [PATCH 3/3] mac80211: Set lower memory limit for non-VHT devices
Date: Fri, 30 Sep 2016 16:35:49 +0200	[thread overview]
Message-ID: <87h98x5ube.fsf@toke.dk> (raw)
In-Reply-To: <1475239915.17481.63.camel@sipsolutions.net> (Johannes Berg's message of "Fri, 30 Sep 2016 14:51:55 +0200")

Johannes Berg <johannes@sipsolutions.net> writes:

>> > I kinda see the logic here - we really don't need to queue as much
>> > if we can't possibly transmit it out quickly - but it seems to me
>> > we should also throw in some kind of limit that's relative to the
>> > amount of memory you have on the system?
>> 
>> Yes, ideally. That goes for FQ-CoDel as well, BTW. LEDE currently
>> carries a patch for that which just changes the hard-coded default to
>> another hard-coded default. Not sure how to get a good value to use,
>> though; and deciding on how large a fraction of memory to use for
>> packets starts smelling an awful lot like setting policy in the
>> kernel, doesn't it?
>
> Yeah, I agree it does seem awkward.
>
> Perhaps we should instead pick a low limit and let users change it
> more easily (i.e. not debugfs)? I don't know a good answer to this
> either.

Hmm, I'll talk it over with some of the LEDE people who are more used to
dealing with these sorts of memory-constrained devices than I am. Will
send a patch if we come up with a good solution :)

-Toke

      reply	other threads:[~2016-09-30 14:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-23 19:59 [Make-wifi-fast] [PATCH 0/3] Add memory limits to fq.h and mac80211 TXQ Toke Høiland-Jørgensen
2016-09-23 19:59 ` [Make-wifi-fast] [PATCH 1/3] fq.h: Port memory limit mechanism from fq_codel Toke Høiland-Jørgensen
2016-09-23 19:59 ` [Make-wifi-fast] [PATCH 2/3] mac80211: Export fq memory limit information in debugfs Toke Høiland-Jørgensen
2016-09-23 19:59 ` [Make-wifi-fast] [PATCH 3/3] mac80211: Set lower memory limit for non-VHT devices Toke Høiland-Jørgensen
2016-09-30 11:33   ` Johannes Berg
2016-09-30 12:41     ` Toke Høiland-Jørgensen
2016-09-30 12:51       ` Johannes Berg
2016-09-30 14:35         ` Toke Høiland-Jørgensen [this message]

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