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From: Dave Taht <dave.taht@gmail.com>
To: Felix Fietkau <nbd@nbd.name>
Cc: make-wifi-fast@lists.bufferbloat.net,
	linux-wireless <linux-wireless@vger.kernel.org>,
	"Michal Kazior" <michal.kazior@tieto.com>,
	"Toke Høiland-Jørgensen" <toke@toke.dk>
Subject: Re: [Make-wifi-fast] TCP performance regression in mac80211 triggered by the fq code
Date: Wed, 13 Jul 2016 11:13:54 +0200	[thread overview]
Message-ID: <CAA93jw5caCtm5Wgkp0-mMZmGTtiGty13Yz1ha20LBa43TavZpQ@mail.gmail.com> (raw)
In-Reply-To: <cac14ead-1af5-ff1d-5b35-592933882aae@nbd.name>

On Wed, Jul 13, 2016 at 10:53 AM, Felix Fietkau <nbd@nbd.name> wrote:

>> To me this implies a contending lock issue, too much work in the irq
>> handler or too delayed work in the softirq handler....
>>
>> I thought you were very brave to try and backport this.
> I don't think this has anything to do with contending locks, CPU
> utilization, etc. The code does something to the packets that TCP really
> doesn't like.

With your 70% idle figure, I am inclined to agree... could you get an aircap
of the two different tests?  - as well as a regular packetcap taken at
the client or server?
And put somewhere I can get at them?

What version of OSX are you running?

I will setup an ath9k box shortly...


-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org

  reply	other threads:[~2016-07-13  9:13 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <11fa6d16-21e2-2169-8d18-940f6dc11dca@nbd.name>
2016-07-12 12:13 ` Dave Taht
2016-07-12 13:21   ` Felix Fietkau
2016-07-12 14:02     ` Dave Taht
2016-07-13  7:57       ` Dave Taht
2016-07-13  8:53         ` Felix Fietkau
2016-07-13  9:13           ` Dave Taht [this message]
2016-07-19 13:10       ` Michal Kazior
     [not found] ` <87shvfujl4.fsf@toke.dk>
     [not found]   ` <CAA93jw6z53P+JCPsjYD-vaY+9vq9ZO-Ob_cXm0AE76uVcM=F9g@mail.gmail.com>
     [not found]     ` <87bn23ui87.fsf@toke.dk>
2016-07-12 13:03       ` Dave Taht

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