From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756907Ab0JKWdr (ORCPT ); Mon, 11 Oct 2010 18:33:47 -0400 Received: from www.tglx.de ([62.245.132.106]:51721 "EHLO www.tglx.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756672Ab0JKWdq (ORCPT ); Mon, 11 Oct 2010 18:33:46 -0400 Date: Tue, 12 Oct 2010 00:33:08 +0200 (CEST) From: Thomas Gleixner To: Benjamin Herrenschmidt cc: Tim Pepper , linux-kernel@vger.kernel.org, Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Marcio Saito , Jiri Slaby , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, John Stultz , Avantika Mathur Subject: Re: [RFC] [PATCH] allow low HZ values? In-Reply-To: <1286836212.5220.19.camel@pasglop> Message-ID: References: <20101011201121.GA953@tpepper-t61p.dolavim.us> <1286836212.5220.19.camel@pasglop> 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 On Tue, 12 Oct 2010, Benjamin Herrenschmidt wrote: > On Mon, 2010-10-11 at 13:11 -0700, Tim Pepper wrote: > > I'm not necessarily wanting to open up the age old question of "what is > > a good HZ", but we were doing some testing on timer tick overheads for > > HPC applications and this came up... > > Note that this is also very useful when working on CPU prototypes > implemented in FPGAs and running at something like 12Mhz :-) /me hands benh 0.5$ for a FPGA upgrade