From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: page fault scalability patch V12 [0/7]: Overview and performance tests Date: Thu, 02 Dec 2004 02:00:37 -0500 Message-ID: <41AEBD95.7030804@pobox.com> References: <41AEB44D.2040805@pobox.com> <20041201223441.3820fbc0.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:52132 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S261565AbULBHAw (ORCPT ); Thu, 2 Dec 2004 02:00:52 -0500 In-Reply-To: <20041201223441.3820fbc0.akpm@osdl.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Andrew Morton Cc: torvalds@osdl.org, benh@kernel.crashing.org, linux-kernel@vger.kernel.org, "linux-ide@vger.kernel.org" Andrew Morton wrote: > We need an -rc3 yet. And I need to do another pass through the > regressions-since-2.6.9 list. We've made pretty good progress there > recently. Mid to late December is looking like the 2.6.10 date. another for that list, BTW: I am currently chasing a 2.6.8->2.6.9 SATA regression, which causes ata_piix (Intel ICH5/6/7) to not-find some SATA devices on x86-64 SMP, but works on UP. Potentially related to >=4GB of RAM. Details, in case anyone is interested: Unless my code is screwed up (certainly possible), PIO data-in [using the insw() call] seems to return all zeroes on a true-blue SMP machine, for the identify-device command. When this happens, libata (correctly) detects a bad id page and bails. (problem doesn't show up on single CPU w/ HT) What changed from 2.6.8 to 2.6.9 is 2.6.8: bitbang ATA taskfile registers (loads command) bitbang ATA data register (read id page) 2.6.9: bitbang ATA taskfile registers queue_work() workqueue thread bitbangs ATA data register (read id page) So I wonder if doesn't like CPU 0 sending I/O traffic to the on-board SATA PCI device, then immediately after that, CPU 1 sending I/O traffic. Anyway, back to debugging... :) Jeff