Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965266AbXBLUJy (ORCPT ); Mon, 12 Feb 2007 15:09:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965268AbXBLUJy (ORCPT ); Mon, 12 Feb 2007 15:09:54 -0500 Received: from nz-out-0506.google.com ([64.233.162.234]:33606 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965266AbXBLUJx (ORCPT ); Mon, 12 Feb 2007 15:09:53 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding; b=Ye7R6OlfkZ7vz0j72kTD68V4PqAEDuX5430Leq/Co1OZ4n6VmdsKRfhwE5mytklrsnbSeDwKFVvDmRbBBQ8reTryqCXs6ISlGKIva/BzPcciDzoxhVa9Da5vQmXYMXbcu2Hq006gmiXK7XtnskWNc/DtZhUBLMTI9QcclKA+iJ8= Message-ID: <45D0C97C.108@gmail.com> Date: Mon, 12 Feb 2007 12:09:32 -0800 From: Tejun Heo User-Agent: Icedove 1.5.0.9 (X11/20061220) MIME-Version: 1.0 To: Matthew Fredrickson CC: linux-kernel@vger.kernel.org, ris Subject: Re: High CPU usage with sata_nv References: <20070115164541.M22367@elsat.net.pl> <20070115165432.M87238@elsat.net.pl> <20070115182642.GA18374@slug> <20070115222320.M55059@elsat.net.pl> <45B43241.1070301@gmail.com> <45D00DF7.6090605@gmail.com> <9d377bf8f83da4ca7935f5a69cde5bef@digium.com> In-Reply-To: <9d377bf8f83da4ca7935f5a69cde5bef@digium.com> Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 833 Lines: 18 Matthew Fredrickson wrote: > I have noticed something that might be related as well. I am working on > a device driver that would have periodic data errors due to > exceptionally long interrupt handling latency. I have come to the point > that I suspect that it's the sata_nv driver, and now that we can't do > the hdparm -u1 option for sata, it seems to be a bigger problem. That's mostly off topic. libata configures DMA if at all possible and fallback to PIO only after a lot of serious errors. Is your drive in pio mode? Or does it happen even when in dma mode? -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/