From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Madhusudhan" Subject: mmcqd seem to use lot of cpu cycles Date: Tue, 1 Sep 2009 12:18:31 -0500 Message-ID: <001401ca2b28$3a99bac0$544ff780@am.dhcp.ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from bear.ext.ti.com ([192.94.94.41]:44118 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256AbZIARSm (ORCPT ); Tue, 1 Sep 2009 13:18:42 -0400 Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Hi, While running one of the MMC use cases in the system I saw that mmcqd seems to eat up a lot of cpu cycles. I saw a thread which discussed some details. http://www.nabble.com/mmcqd-uses-a-large-amount-of-cpu-td23768078.html Any clue on what this process is doing? If a low level driver is using DMA I am not sure why there is so much load on the system due to mmcqd? Any thoughts? Regards, Madhu