Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755390AbZCTKuT (ORCPT ); Fri, 20 Mar 2009 06:50:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751514AbZCTKuE (ORCPT ); Fri, 20 Mar 2009 06:50:04 -0400 Received: from www.tglx.de ([62.245.132.106]:36641 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751311AbZCTKuD (ORCPT ); Fri, 20 Mar 2009 06:50:03 -0400 Date: Fri, 20 Mar 2009 11:49:52 +0100 (CET) From: Thomas Gleixner To: Michal Simek cc: LKML , john.williams@petalogix.com, John Stultz Subject: Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support, selfmod code In-Reply-To: <49C371F5.5010100@monstr.eu> Message-ID: References: <1237408284-8674-1-git-send-email-monstr@monstr.eu> <0168f03c96e9479ede695a9859c8a0691baa8ef3.1237407249.git.monstr@monstr.eu> <4b5aee01d11fc790c7842838ea63a82ee3273003.1237407249.git.monstr@monstr.eu> <5f8b2a60496983f572ef6d3b4e2f986c167a8336.1237407249.git.monstr@monstr.eu> <20fd42a1e8837c7352d35d157aa3393e88152c32.1237407249.git.monstr@monstr.eu> <49C2AB09.9040300@monstr.eu> <49C36149.9000703@monstr.eu> <49C371F5.5010100@monstr.eu> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 782 Lines: 24 On Fri, 20 Mar 2009, Michal Simek wrote: > Why is my .resolution: 10000000 nsecs? It seems to me weird. Well. The resulution there is the granularity which the kernel uses to expire application timers. Once the kernel switches to high resolution mode it sets the granularity to 1ns. To get high resolution mode you need two things: 1) a suitable clocksource - which needs to have the CLOCK_SOURCE_IS_CONTINUOUS flag set 2) a clock event device which has CLOCK_EVT_FEAT_PERIODIC flag set. 3) CONFIG_HIGH_RES_TIMERS=y Thanks, tglx -- 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/