From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932147AbeENQlV (ORCPT ); Mon, 14 May 2018 12:41:21 -0400 Received: from muru.com ([72.249.23.125]:41980 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752988AbeENQlT (ORCPT ); Mon, 14 May 2018 12:41:19 -0400 Date: Mon, 14 May 2018 09:41:15 -0700 From: Tony Lindgren To: Faiz Abbas Cc: "linux-kernel@vger.kernel.org" , linux-omap , linux-mmc@vger.kernel.org, Ulf Hansson , Linus Walleij Subject: Re: MMC performance degradation due to too many requests Message-ID: <20180514164115.GL98604@atomide.com> References: <0ea1d2bf-fa0f-4b3d-556a-5dca5afbf2a9@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0ea1d2bf-fa0f-4b3d-556a-5dca5afbf2a9@ti.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Faiz Abbas [180514 11:31]: > Hi Everyone, > > I am debugging a performance degradation issue in some SD cards which > happened around 4.13 kernel on TI's AM335x-evm. > > I compare the time taken for a simple dd command (after dropping > caches) to run between kernel versions 4.13 and 4.14. I see that there > is a consistent 15-20% reduction in speed. The amount of decrease > depends on the card used. Care to run git bisect between v4.13 and v4.14? Seems like that should work just fine between that range for boot and performance testing. Regards, Tony