From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1GShmo-0006dK-Ln for qemu-devel@nongnu.org; Wed, 27 Sep 2006 18:21:50 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1GShmk-0006Zt-P6 for qemu-devel@nongnu.org; Wed, 27 Sep 2006 18:21:50 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GShmk-0006ZQ-F8 for qemu-devel@nongnu.org; Wed, 27 Sep 2006 18:21:46 -0400 Received: from [65.74.133.4] (helo=mail.codesourcery.com) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1GShrh-0007or-75 for qemu-devel@nongnu.org; Wed, 27 Sep 2006 18:26:53 -0400 From: Paul Brook Subject: Re: [Qemu-devel] RAM overcomittment Date: Wed, 27 Sep 2006 23:21:42 +0100 References: <1ACF2542-5DEE-49B5-8177-5B958911B0F6@gmail.com> <3210330950.20060927165724@planetolsen.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200609272321.43534.paul@codesourcery.com> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org > > However, swapping (using virtual memory) will be a huge performance > > killer. It will affect the performance of your host OS and all > > applications, as well as for your QEMU instances. > > The problem is the swaping even the VM don't need all of ressource > assigned... We lost RAM... You need to fix your host OS then. If the guest isn't using the memory it shouldn't be swapped in. Paul