From owner-freebsd-performance@FreeBSD.ORG Sat Nov 3 23:30:09 2007 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4500E16A417 for ; Sat, 3 Nov 2007 23:30:09 +0000 (UTC) (envelope-from josh.carroll@gmail.com) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.179]) by mx1.freebsd.org (Postfix) with ESMTP id ED05B13C48D for ; Sat, 3 Nov 2007 23:30:08 +0000 (UTC) (envelope-from josh.carroll@gmail.com) Received: by py-out-1112.google.com with SMTP id u77so2369472pyb for ; Sat, 03 Nov 2007 16:29:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=Een5jtcms8F+NGVosdOCVbUOZyZVuA3p4pq+cB0EB7s=; b=GZIglKT5XWA3oNjtRnpaSI4XcVn2ffmKHW/t3UNZr6Bw1gi+lXOEw0QXi4QwEopUqovOkQmMvVzL/sT/KZ4d2SLu3FPlAjIURb1WXOAN3EBW+lu5pesjmGVhyG49IC+IZSCF+cOD7oWM7JPS+hEH6AO/W5+fnRKXLv1F7wz6ut4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=KXYPyMqXCCsHpwyEn9TuiLx/x0w3Y/5M6HYC8uX1F1RS6cATd3Me+66/REtkLDpaQEF8DJi+Db5rj/RwXK9rdWaBqzkKL4jdDphw034Cqny/4n5IiCvMcjpCkZdwMtbqYQmMNljp3dPWdKCK6a1RyGwELi1C7GbwyyfXV5nIZ1c= Received: by 10.35.92.18 with SMTP id u18mr3980319pyl.1194132599464; Sat, 03 Nov 2007 16:29:59 -0700 (PDT) Received: by 10.35.110.17 with HTTP; Sat, 3 Nov 2007 16:29:59 -0700 (PDT) Message-ID: <8cb6106e0711031629j68e181ccra0f16ee6f42ed982@mail.gmail.com> Date: Sat, 3 Nov 2007 19:29:59 -0400 From: "Josh Carroll" To: "Jeff Roberson" In-Reply-To: <20071102150028.R544@10.0.0.1> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <8cb6106e0710230902x4edf2c8eu2d912d5de1f5d4a2@mail.gmail.com> <20071024111105.M598@10.0.0.1> <8cb6106e0710241229i12852d8cq436f4c955ac62c56@mail.gmail.com> <20071024133240.X598@10.0.0.1> <8cb6106e0710251925s2db0117cvcb67321b08d7b2a1@mail.gmail.com> <20071102102331.G544@10.0.0.1> <8cb6106e0711021306w10c48a15s99eab526064ac814@mail.gmail.com> <20071102150028.R544@10.0.0.1> Cc: freebsd-performance@freebsd.org Subject: Re: ULE vs. 4BSD in RELENG_7 X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: josh.carroll@gmail.com List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Nov 2007 23:30:09 -0000 > What would be interesting to know is if the sum of the temperatures is any > different. 4BSD gets a much more random distribution of load because a > thread is run on whatever cpu context switches next. ULE will have > specific load patterns since it scans lists of cpus in a fixed order to > assign load. So that means it prefers to run on lower numbered cpus if > they are idle. This should have a side effect of allowing unused cores to > powerdown more frequently than with 4BSD although I have not verified this > in practice. The sum of the core temperatures when the system is idle is the same for both ULE and 4BSD. 125 C in my case (31.25 C average). Under load, the sum (again for both) is 184 C. So you're absolutely correct, while one core seems to get these short bursts (probably my rrd script doing its thing), perhaps this is shared over the cores with 4BSD. The overall temperature remains the same. Josh