From owner-freebsd-stable@FreeBSD.ORG Thu Feb 26 16:14:13 2009 Return-Path: Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 246901065675 for ; Thu, 26 Feb 2009 16:14:13 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 396E28FC28 for ; Thu, 26 Feb 2009 16:14:11 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua [212.40.38.101]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id SAA06124 for ; Thu, 26 Feb 2009 18:14:10 +0200 (EET) (envelope-from avg@icyb.net.ua) Message-ID: <49A6BFD1.6090601@icyb.net.ua> Date: Thu, 26 Feb 2009 18:14:09 +0200 From: Andriy Gapon User-Agent: Thunderbird 2.0.0.19 (X11/20090110) MIME-Version: 1.0 To: freebsd-stable@FreeBSD.ORG X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Subject: qemu+aio vs C2 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Feb 2009 16:14:13 -0000 I see something unusual and surprising for me: if I kldload aio for qemu's sake and then actually start qemu, I see that share of C2 in cx_usage is constantly dropping and then finally there is "too many short sleeps, backing off to C1". This is on i386 with stable/7 as of r188116. I am out of ideas. -- Andriy Gapon