From owner-freebsd-arch@FreeBSD.ORG  Thu Aug 21 07:47:56 2008
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F1E031065678
	for <freebsd-arch@freebsd.org>; Thu, 21 Aug 2008 07:47:56 +0000 (UTC)
	(envelope-from jroberson@jroberson.net)
Received: from qb-out-0506.google.com (qb-out-0506.google.com [72.14.204.235])
	by mx1.freebsd.org (Postfix) with ESMTP id B0DC78FC1A
	for <freebsd-arch@freebsd.org>; Thu, 21 Aug 2008 07:47:56 +0000 (UTC)
	(envelope-from jroberson@jroberson.net)
Received: by qb-out-0506.google.com with SMTP id e34so1359499qbe.35
	for <freebsd-arch@freebsd.org>; Thu, 21 Aug 2008 00:47:56 -0700 (PDT)
Received: by 10.114.182.15 with SMTP id e15mr1100382waf.186.1219304875440;
	Thu, 21 Aug 2008 00:47:55 -0700 (PDT)
Received: from ?10.0.1.199? ( [24.94.72.120])
	by mx.google.com with ESMTPS id j34sm375106waf.48.2008.08.21.00.47.52
	(version=SSLv3 cipher=RC4-MD5); Thu, 21 Aug 2008 00:47:54 -0700 (PDT)
Date: Wed, 20 Aug 2008 21:47:01 -1000 (HST)
From: Jeff Roberson <jroberson@jroberson.net>
X-X-Sender: jroberson@desktop
To: Andrew Reilly <andrew-freebsd@areilly.bpc-users.org>
In-Reply-To: <20080819134005.GA85664@duncan.reilly.home>
Message-ID: <20080820214627.C30593@desktop>
References: <20080819025019.GA27997@duncan.reilly.home>
	<20080818215813.H952@desktop>
	<20080819134005.GA85664@duncan.reilly.home>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Cc: freebsd-multimedia@freebsd.org, freebsd-arch@freebsd.org
Subject: Re: SCHED_ULE problem: slow single processor, realtime prio vs
 network stack
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Aug 2008 07:47:57 -0000

On Tue, 19 Aug 2008, Andrew Reilly wrote:

> On Mon, Aug 18, 2008 at 10:00:12PM -1000, Jeff Roberson wrote:
>> Can you tell me what % cpu the audio application uses while running?  Have
>> you tried nice -20 instead of rtprio?
>
> It's currently using about 10%, maybe a bit more.  I expect
> it to get heavier as I add more to it.  I have hopes of it
> continuing to work even at 60 to 80% of CPU.
>
> I haven't tried nice -20 because I don't want the priority to
> drift or change, which is something that I thought the normal
> levels did.  I'll give it a go though, and report back.

With such a low cpu utilization I wouldn't expect it's the scheduling 
algorithm.  It may be a difference in preemption settings.  Is preemption 
enabled in both kernels?

Jeff

>
> Cheers,
>
> Andrew
>