Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751315AbVIWVcn (ORCPT ); Fri, 23 Sep 2005 17:32:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751316AbVIWVcn (ORCPT ); Fri, 23 Sep 2005 17:32:43 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.142]:40617 "EHLO e2.ny.us.ibm.com") by vger.kernel.org with ESMTP id S1751315AbVIWVcm (ORCPT ); Fri, 23 Sep 2005 17:32:42 -0400 Date: Fri, 23 Sep 2005 14:32:41 -0700 From: Nishanth Aravamudan To: Alexey Dobriyan Cc: Nish Aravamudan , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: tty update speed regression (was: 2.6.14-rc2-mm1) Message-ID: <20050923213241.GB3950@us.ibm.com> References: <20050921222839.76c53ba1.akpm@osdl.org> <20050922195029.GA6426@mipter.zuzino.mipt.ru> <20050922214926.GA6524@mipter.zuzino.mipt.ru> <20050923000815.GB2973@us.ibm.com> <29495f1d050923101228384a34@mail.gmail.com> <20050923184216.GA6452@mipter.zuzino.mipt.ru> <20050923190749.GO5910@us.ibm.com> <20050923194252.GA6460@mipter.zuzino.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050923194252.GA6460@mipter.zuzino.mipt.ru> X-Operating-System: Linux 2.6.14-rc2 (x86_64) User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1037 Lines: 28 On 23.09.2005 [23:42:53 +0400], Alexey Dobriyan wrote: > On Fri, Sep 23, 2005 at 12:07:49PM -0700, Nishanth Aravamudan wrote: > > On 23.09.2005 [22:42:16 +0400], Alexey Dobriyan wrote: > > > poll([{fd=0, events=POLLIN}], 1, 0) = 0 > > > > I can send full strace log if needed. > > > > Nope, that helped tremendously! I think I know what the issue is (and > > why it's HZ dependent). > > > > In the current code, (2.6.13.2, e.g) we allow 0 timeout poll-requests to > > be resolved as 0 jiffy requests. But in my patch, those requests become > > 1 jiffy (which of course depends on HZ and gets quite long if HZ=100)! > > > > Care to try the following patch? > > It works! Now, even with HZ=100, gameplay is smooth. > > Andrew, please, apply. Great! Thanks for the testing, Alexey. -Nish - 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/