From owner-freebsd-stable@FreeBSD.ORG Thu Feb 26 16:27:26 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 4BB291065673 for ; Thu, 26 Feb 2009 16:27:26 +0000 (UTC) (envelope-from onemda@gmail.com) Received: from mail-fx0-f158.google.com (mail-fx0-f158.google.com [209.85.220.158]) by mx1.freebsd.org (Postfix) with ESMTP id D2EFB8FC1E for ; Thu, 26 Feb 2009 16:27:25 +0000 (UTC) (envelope-from onemda@gmail.com) Received: by fxm2 with SMTP id 2so588820fxm.43 for ; Thu, 26 Feb 2009 08:27:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=qYXrTulLPRh2lrY3uNGWQr2qLXMPWHW8/+974Zxc9gQ=; b=D6swoBIAR5vq7Hf8r6L31yHE6wTb2eRLmsYKak70gRln3sm9kwxk5Wtp3MCT0haYFS bxTWNU4mhrHWrPmeYurdoTFo9ieifLg83wEkBxFyPQwGu3z2dx574w6LZBVJDM+Ej++e zj+yYv0HEi/JToCKx2hlMXZ5atpKdz7C21FF4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=VeKNE+DueGcIVXR3Eqo85PE60iBjV2WnhVDyP7S81QjEuo4st9zWwXrDiKhHwv4VIi M+Y7JDGc3vo618nfj/cazj4R7mrcNulJjxG2u2QBmBeaXUIapgxi0goP6uDgx716Bt7I ta9VEOPx62LwO+8VyDFGoPXzC1uLp9g33rFXM= MIME-Version: 1.0 Received: by 10.223.113.136 with SMTP id a8mr2257548faq.76.1235665644766; Thu, 26 Feb 2009 08:27:24 -0800 (PST) In-Reply-To: <49A6BFD1.6090601@icyb.net.ua> References: <49A6BFD1.6090601@icyb.net.ua> Date: Thu, 26 Feb 2009 17:27:24 +0100 Message-ID: <3a142e750902260827w722f110eve23a7bdb07cfbe42@mail.gmail.com> From: "Paul B. Mahol" To: Andriy Gapon Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: 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 16:27:26 -0000 On 2/26/09, Andriy Gapon wrote: > > 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. And qemu guest is? Perhaps you should try changing guest kern.hz sysctl setting. I dont think related comitt got MFC-ed to STABLE. -- Paul