From owner-freebsd-stable@FreeBSD.ORG Fri Jun 11 06:03:09 2010 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 DB5591065676 for ; Fri, 11 Jun 2010 06:03:09 +0000 (UTC) (envelope-from jtgotis@gmail.com) Received: from mail-pv0-f182.google.com (mail-pv0-f182.google.com [74.125.83.182]) by mx1.freebsd.org (Postfix) with ESMTP id B22898FC1A for ; Fri, 11 Jun 2010 06:03:09 +0000 (UTC) Received: by pvb32 with SMTP id 32so430955pvb.13 for ; Thu, 10 Jun 2010 23:03:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=mPWSU/4tKOJXE7a93K+5gusGdIfy54dtmCXaggbzLkA=; b=oG5qAodJzpY26MDHwXMlKao7eFj9eSLEBAJiP6uutP8HVbp+ZQ/aBqumDtmpMs9tUg SfdeVaFvsdQoB3EbgeDxLC+bXa3JpgLoBja5yEilumr0TtVbvhgV0+PYnRuVofI/pXE9 Xnx0xgjzsot/oljHXd0bt/RmQ5HvhTCCazWZ4= 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 :content-type; b=pVCfd7mv8bfT0WJrF+VF6WADXW+kNoVnG3lTCM/4eU7yB9TFJgo77EwsTJlYTuwSWv q8s7rzMhq/uyBdAT42mq/ipnty97Ji+EJTm07vHAvMJpJupCSEpsn2pwLsVZoRlijfg6 Ogmp7VOovOKCBNawXf1J4pnbSop7D8K9O8BNE= MIME-Version: 1.0 Received: by 10.142.56.8 with SMTP id e8mr929606wfa.117.1276236189095; Thu, 10 Jun 2010 23:03:09 -0700 (PDT) Received: by 10.143.168.14 with HTTP; Thu, 10 Jun 2010 23:03:08 -0700 (PDT) In-Reply-To: <20100610230300.GA51804@stack.nl> References: <20100610230300.GA51804@stack.nl> Date: Fri, 11 Jun 2010 14:03:08 +0800 Message-ID: From: Jansen Gotis To: freebsd-stable@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Subject: Re: "calcru: runtime went backwards" messages 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: Fri, 11 Jun 2010 06:03:09 -0000 On Fri, Jun 11, 2010 at 7:03 AM, Jilles Tjoelker wrote: > On Fri, Jun 11, 2010 at 12:35:05AM +0800, Jansen Gotis wrote: >> Hi, for the past couple of months since moving to RELENG_8 I've been >> receiving "calcru: runtime went backwards" messages on the console. > > > This may well be a manifestation of a brokenness (which should not be > unknown) in how FreeBSD stores CPU time utilization. The time is > maintained in "CPU ticks" (CPU clock cycles), so if the clock frequency > changes, the values of existing processes will be wrong (a jump when > converted to seconds). When calcru detects this, it generates messages > like the above. If this analysis is right, the messages can be ignored, > but indicate that CPU time statistics may be inaccurate. > You're probably right, the messages can be ignored. I don't see any issues other than the messages being printed on the console; I don't experience freezing, etc. It just struck me as weird because searching the -current and -stable mailing lists does not show anyone else having the issue as recently as I have. Just some more info to add which I forgot about last time...setting kern.hz to 100 did not help. Thanks for the reply. Best regards, Jansen