linux-kernel - Re: [PREEMPT-RT] [patch 4 14/22] timer: Switch to a non cascading wheel

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Message-ID: <20160811202544.GA20512@linutronix.de>
Date:	Thu, 11 Aug 2016 22:25:44 +0200
From:	rcochran@...utronix.de
To:	Jouni Malinen <jkmalinen@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Len Brown <lenb@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	George Spelvin <linux@...encehorizons.net>,
	Josh Triplett <josh@...htriplett.org>,
	Chris Mason <clm@...com>, Eric Dumazet <edumazet@...gle.com>,
	rt@...utronix.de, Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PREEMPT-RT] [patch 4 14/22] timer: Switch to a non cascading
 wheel

On Thu, Aug 11, 2016 at 06:21:26PM +0300, Jouni Malinen wrote:
> The test code looked like this in python:
> 
>     addr = (url.hostname, url.port)
>     socks = {}
>     for i in range(20):
>         socks[i] = socket.socket(socket.AF_INET, socket.SOCK_STREAM,
>                                  socket.IPPROTO_TCP)
>         socks[i].connect(addr)

You getting a timeout on TCP connect()?  Isn't that timeout really
long, like 75 seconds or something?
 
> I can reproduce this easily, so if someone wants to get more details
> of the issue, just let me know how to collect whatever would be
> useful.

Can you provide a simple test case or explain in more detail how you
run your test?  I would like to reproduce the issue it here.

Thanks,
Richard