Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932118AbWEPRTN (ORCPT ); Tue, 16 May 2006 13:19:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932160AbWEPRTM (ORCPT ); Tue, 16 May 2006 13:19:12 -0400 Received: from py-out-1112.google.com ([64.233.166.180]:47920 "EHLO py-out-1112.google.com") by vger.kernel.org with ESMTP id S932118AbWEPRTL convert rfc822-to-8bit (ORCPT ); Tue, 16 May 2006 13:19:11 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=lJHWi4vRIWah4pKsaP6SsjXxBJ+sjeZtO1USUAViBcPpevoT4cwIqm9WxYclId+SmvWmkb1SrsOV8yg/GhY3cF9KuWU2gQQ79Fwx5WZ+SDybVdbKzi520n8ezwp/2ovDC0vGNsp86/n2/NJQMngFUcyfpb4yMfYyFqtfSs16iyY= Message-ID: <3b0ffc1f0605161019j7149f72bv309db19eb9d12dd8@mail.gmail.com> Date: Tue, 16 May 2006 13:19:11 -0400 From: "Kevin Radloff" To: "Alan Cox" Subject: Re: PATCH: Fix broken PIO with libata Cc: linux-kernel@vger.kernel.org In-Reply-To: <1147794791.2151.71.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <1147790393.2151.62.camel@localhost.localdomain> <3b0ffc1f0605160833k5f6355c5n3f2a9ab1b211a95@mail.gmail.com> <1147794791.2151.71.camel@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1010 Lines: 24 On 5/16/06, Alan Cox wrote: > On Maw, 2006-05-16 at 11:33 -0400, Kevin Radloff wrote: > > However, I still have a problem with pata_pcmcia (that I actually > > experienced also with the ide-cs driver) where sustained reading or > > writing to the CF card spikes the CPU with nearly 100% system time. > > That is normal. The PCMCIA devices don't support DMA. As a result of > this the processor has to fetch each byte itself over the ISA speed > PCMCIA bus link. Hrm, as I recall that only started happening with ide-cs sometime in the single digits of 2.6.x.. And note that it's only maxing out at about 1.5MB/s. Should that saturate my laptop's 1.1GHz Pentium M processor? -- Kevin 'radsaq' Radloff radsaq@gmail.com http://thesaq.com/ - 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/