From: Amit Gud Subject: Re: [PATCH] NFS: Add acreg{min,max} and acdir{min,max} in milliseconds Date: Wed, 10 Jun 2009 12:43:31 -0700 Message-ID: <4A300CE3.8080502@akamai.com> References: <200906091832.50633.agud@akamai.com> <1244636844.24750.23.camel@heimdal.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: linux-nfs@vger.kernel.org, steved@redhat.com, gud-OYTqUY/oFF8@public.gmane.org, "Uhlenkott, Jason" To: Trond Myklebust Return-path: Received: from prod-mail-xrelay01.akamai.com ([72.246.2.12]:46245 "EHLO prod-mail-xrelay01.akamai.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754620AbZFJTt7 (ORCPT ); Wed, 10 Jun 2009 15:49:59 -0400 In-Reply-To: <1244636844.24750.23.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: Trond Myklebust wrote: > On Tue, 2009-06-09 at 18:32 -0700, Amit Gud wrote: >> This patch adds 4 new NFS mount options(acdirminms, acdirmaxms, acregminms, >> acregmaxms) converting already existing one into a millisecond resolution >> instead of seconds. >> >> Also, modifies the mountstats output to milliseconds instead of seconds. > > Why, exactly, do you need to control cache timeouts down to the > millisecond level? > The problem is to make the updates visible from one client to the other in less than a second and turning off caching entirely has an unacceptably high penalty. AG -- May the source be with you. http://www.cis.ksu.edu/~gud