From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751413AbZH0HNs (ORCPT ); Thu, 27 Aug 2009 03:13:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751328AbZH0HNr (ORCPT ); Thu, 27 Aug 2009 03:13:47 -0400 Received: from mail-gx0-f205.google.com ([209.85.217.205]:49922 "EHLO mail-gx0-f205.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751291AbZH0HNr convert rfc822-to-8bit (ORCPT ); Thu, 27 Aug 2009 03:13:47 -0400 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=KkMkQupo6mOKNKWVzNToAJyUk27xLmmgzj3RfO7E+AxF/TfgcQYeWP/Xztejddrcvx JSYpIXkCg/iH5AyhIG/f6cCE+UNV/SLOFecLGNjr/IKaLnGtwlOrOIKwEeJCKTFfJq1Z yaedENvjV6kR3Wf4HtW5YyGBVpfuTpVHr7VF0= MIME-Version: 1.0 In-Reply-To: <200908270313.32528.volkerarmin@googlemail.com> References: <200908211814.56800.volkerarmin@googlemail.com> <200908222126.31390.volkerarmin@googlemail.com> <86802c440908222322s44957498s72a76940f89271cf@mail.gmail.com> <200908270313.32528.volkerarmin@googlemail.com> Date: Thu, 27 Aug 2009 00:13:48 -0700 Message-ID: <86802c440908270013k4b8c75b1h6bac33a623ded5e7@mail.gmail.com> Subject: Re: amd64 + mtrr: only 3.1gb of 8gb are covered, kernel 2.6.30 and earlier. From: Yinghai Lu To: Volker Armin Hemmann Cc: linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 26, 2009 at 6:13 PM, Volker Armin Hemmann wrote: > Hi, > > On Sonntag 23 August 2009, Yinghai Lu wrote: >> On Sat, Aug 22, 2009 at 12:26 PM, Volker Armin >> >> Hemmann wrote: >> > when I went from 4gb to 6gb I had a performance degradation. Since the >> > 8gb are faster and the new cpu is faster, I don't see degradation. But I >> > wonder how much better performance could be with 'correct' mtrr. >> >> that is weird. with 4g should have mem hole remapping. >> >> do you still have /proc/mtrr for 6g setup? >> >> YH > > some more information, mtrr of 8gb with my X2 6000: > > reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back > reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back > reg02: base=0x0c0000000 ( 3072MB), size=  128MB, count=1: write-back > reg03: base=0x0c8000000 ( 3200MB), size=   64MB, count=1: write-back > reg04: base=0x0cc000000 ( 3264MB), size=   32MB, count=1: write-back > reg05: base=0x0ce000000 ( 3296MB), size=   16MB, count=1: write-back > > from June with 2.6.30, dmesg from that incident is attached > > compared that with the mtrr with my X4: > > reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back > reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back > reg02: base=0x0c0000000 ( 3072MB), size=  128MB, count=1: write-back > > > just ignore the fgrlx parts - whenever I checked it did not made a difference > if X was started or not. > theo one with X4, you got extra device [ 0.383812] pci 0000:03:00.0: reg 10 io port: [0xd800-0xd8ff] [ 0.383828] pci 0000:03:00.0: reg 18 64bit mmio: [0xfebff000-0xfebfffff] [ 0.383844] pci 0000:03:00.0: reg 30 32bit mmio: [0xfebc0000-0xfebdffff] [ 0.383878] pci 0000:03:00.0: supports D1 D2 [ 0.383879] pci 0000:03:00.0: PME# supported from D1 D2 D3hot D3cold [ 0.383916] pci 0000:03:00.0: PME# disabled so BIOS allocate more mmio space for it. YH