From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Sat, 3 Nov 2012 13:40:48 -0400 To: 9fans@9fans.net Message-ID: In-Reply-To: <20121103171322.GA76929@intma.in> References: <4A0E7310-9D9D-45C5-88A3-62B4A3191267@quintile.net> <20121103163103.GA48522@intma.in> <5cff355142bfe83410dce1c3fc321f25@kw.quanstro.net> <20121103165100.GA63071@intma.in> <7cd2c11374f75d628a5bb5e1f1d0919e@kw.quanstro.net> <20121103171322.GA76929@intma.in> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Kernel panic when allocating a huge memory Topicbox-Message-UUID: d2591d68-ead7-11e9-9d60-3106f5b1d025 On Sat Nov 3 13:14:17 EDT 2012, khm-9@intma.in wrote: > On Sat, Nov 03, 2012 at 01:04:15PM -0400, erik quanstrom wrote: > > > > in modern systems, i believe they mean the same thing. > > > > http://en.wikipedia.org/wiki/Paging#Terminology > > > > Sorry, I didn't know you were talking about Windows NT. > > > > memory deduplication? is that true? > > > > http://lwn.net/Articles/454795/ > > hiro was asking if plan 9 deduplicates memory. perhaps my comment about double-swap/paging was not clear enough. i was considering the hosted os, with some standard vm such as esxi, vbox, xen or whatever as the host. in such a case it makes no sense to me for the hosted os to page/swap as the hypervisor is perfectly capable of doing this itself. in fact, i think having the guest page/swap while the hypervisor is page/swaping is going to tend to make things more difficult because of i/o contention, and the fact that doing i/o tends to temporarly increase memory use. on the other hand, if you want to press plan 9 into service as the hypervisor (has anyone done this?), you are going to need fairly robust swap/pageing capabilities. and if you want to get real utility out of the hypervisor, you're going to need snapshotting and support for network connection redirection as well. - erik