From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751269AbWEPPkT (ORCPT ); Tue, 16 May 2006 11:40:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751241AbWEPPkS (ORCPT ); Tue, 16 May 2006 11:40:18 -0400 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:35504 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1751269AbWEPPkR (ORCPT ); Tue, 16 May 2006 11:40:17 -0400 Subject: Re: PATCH: Fix broken PIO with libata From: Alan Cox To: Kevin Radloff Cc: linux-kernel@vger.kernel.org In-Reply-To: <3b0ffc1f0605160833k5f6355c5n3f2a9ab1b211a95@mail.gmail.com> References: <1147790393.2151.62.camel@localhost.localdomain> <3b0ffc1f0605160833k5f6355c5n3f2a9ab1b211a95@mail.gmail.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 16 May 2006 16:53:11 +0100 Message-Id: <1147794791.2151.71.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-4.fc4) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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. Alan