Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261236AbUCPSdS (ORCPT ); Tue, 16 Mar 2004 13:33:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261368AbUCPSdS (ORCPT ); Tue, 16 Mar 2004 13:33:18 -0500 Received: from fmr05.intel.com ([134.134.136.6]:64203 "EHLO hermes.jf.intel.com") by vger.kernel.org with ESMTP id S261236AbUCPSdN (ORCPT ); Tue, 16 Mar 2004 13:33:13 -0500 From: Mark Gross Organization: Intel To: Jamie Lokier , Horst von Brand Subject: Re: finding out the value of HZ from userspace Date: Tue, 16 Mar 2004 10:16:02 -0800 User-Agent: KMail/1.5.4 Cc: lkml References: <20040311141703.GE3053@luna.mooo.com> <200403140245.i2E2jKSx005375@eeyore.valparaiso.cl> <20040315081713.GB7188@mail.shareable.org> In-Reply-To: <20040315081713.GB7188@mail.shareable.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200403161016.02568.mgross@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 748 Lines: 19 On Monday 15 March 2004 00:17, Jamie Lokier wrote: > Horst von Brand wrote: > > What for? It should be invisible to userspace... > > It's not invisible. select/poll/epoll/setitimer round their time > argument according to HZ, and programs which do smooth (i.e. low > _jitter_) animation of the kind where the eye is sensitive to the > jitter need to track it and correct for it. > Wouldn't it be better to just use high res timers and associated posix interfaces or low jitter applications? --mgross - 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/