From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [RFC][PATCH 2/9] deadlock prevention core Date: Thu, 17 Aug 2006 20:24:39 -0400 Message-ID: <44E508C7.1080907@redhat.com> References: <20060808211731.GR14627@postel.suug.ch> <44DBED4C.6040604@redhat.com> <44DFA225.1020508@google.com> <20060813.165540.56347790.davem@davemloft.net> <44DFD262.5060106@google.com> <20060813185309.928472f9.akpm@osdl.org> <1155530453.5696.98.camel@twins> <20060813215853.0ed0e973.akpm@osdl.org> <44E3E964.8010602@google.com> <20060816225726.3622cab1.akpm@osdl.org> <44E5015D.80606@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Andrew Morton , Peter Zijlstra , David Miller , tgraf@suug.ch, linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Mike Christie Return-path: Received: from mx1.redhat.com ([66.187.233.31]:19596 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1750858AbWHRA07 (ORCPT ); Thu, 17 Aug 2006 20:26:59 -0400 To: Daniel Phillips In-Reply-To: <44E5015D.80606@google.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Daniel Phillips wrote: > Andrew Morton wrote: >> Daniel Phillips wrote: >>> What happened to the case where we just fill memory full of dirty file >>> pages backed by a remote disk? >> >> Processes which are dirtying those pages throttle at >> /proc/sys/vm/dirty_ratio% of memory dirty. So it is not possible to >> "fill" >> memory with dirty pages. If the amount of physical memory which is dirty >> exceeds 40%: bug. > So we make 400 MB of a 1 GB system unavailable for write caching just to > get around the network receive starvation issue? > > What happens if some in kernel user grabs 68% of kernel memory to do some > very important thing, does this starvation avoidance scheme still work? Also think about eg. scientific calculations, or anonymous memory. People want to be able to use a larger percentage of their memory for dirty data, without swapping... -- What is important? What you want to be true, or what is true?