From owner-freebsd-hackers@FreeBSD.ORG  Sun Jul 13 07:47:34 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 8541A1065676;
	Sun, 13 Jul 2008 07:47:34 +0000 (UTC)
	(envelope-from eugen@kuzbass.ru)
Received: from www.svzserv.kemerovo.su (www.svzserv.kemerovo.su
	[213.184.65.80])
	by mx1.freebsd.org (Postfix) with ESMTP id D86388FC19;
	Sun, 13 Jul 2008 07:47:33 +0000 (UTC)
	(envelope-from eugen@kuzbass.ru)
Received: from www.svzserv.kemerovo.su (eugen@localhost [127.0.0.1])
	by www.svzserv.kemerovo.su (8.13.8/8.13.8) with ESMTP id m6D7lUQg094503;
	Sun, 13 Jul 2008 15:47:30 +0800 (KRAST)
	(envelope-from eugen@www.svzserv.kemerovo.su)
Received: (from eugen@localhost)
	by www.svzserv.kemerovo.su (8.13.8/8.13.8/Submit) id m6D7lUQw094502;
	Sun, 13 Jul 2008 15:47:30 +0800 (KRAST) (envelope-from eugen)
Date: Sun, 13 Jul 2008 15:47:30 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
To: Kris Kennaway <kris@freebsd.org>
Message-ID: <20080713074730.GA93887@svzserv.kemerovo.su>
References: <Pine.GSO.4.64.0807121125300.20326@zeno.ucsd.edu>
	<4879563B.5090201@FreeBSD.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4879563B.5090201@FreeBSD.org>
User-Agent: Mutt/1.4.2.3i
X-Mailman-Approved-At: Sun, 13 Jul 2008 13:35:32 +0000
Cc: Nate Eldredge <neldredge@math.ucsd.edu>, freebsd-hackers@freebsd.org
Subject: Re: SCHED_4BSD bad interactivity on 7.0 vs 6.3
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 13 Jul 2008 07:47:34 -0000

On Sun, Jul 13, 2008 at 03:11:23AM +0200, Kris Kennaway wrote:

> >It seems like there has been a regression in interactivity from 
> >6.3-RELEASE to 7.0-RELEASE when using the SCHED_4BSD scheduler.  After 
> >upgrading my single-cpu amd64 box, 7.0 has much worse latency.  When 
> >running a kernel compile, there is a noticeable lag to echo my typing or 
> >scroll my browser windows, and playing an mp3 frequently cuts out for a 
> >second or two.  This did not happen on 6.3-RELEASE.
> 
> Are you sure it's not the x.org server bug that was present in the 
> version shipped with 7.0?

No, it's not. I have exactly the same problem with SCHED_4BSD
after upgrade from 6.3-STABLE to 7.0-STABLE. I didn't upgrade
my x.org 6.9.0, only OS (all 6.x compat shims are installed).
There is some sort of regression, certainly.

Eugene Grosbein