From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757963AbbFQQii (ORCPT ); Wed, 17 Jun 2015 12:38:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35598 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753584AbbFQQi3 (ORCPT ); Wed, 17 Jun 2015 12:38:29 -0400 Message-ID: <5581A281.4000308@redhat.com> Date: Wed, 17 Jun 2015 18:38:25 +0200 From: Paolo Bonzini User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: "Michael S. Tsirkin" CC: Igor Mammedov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH 3/5] vhost: support upto 509 memory regions References: <20150617134848-mutt-send-email-mst@redhat.com> <20150617142339.6e6deb12@nial.brq.redhat.com> <20150617151030-mutt-send-email-mst@redhat.com> <5581742C.9060100@redhat.com> <20150617163028-mutt-send-email-mst@redhat.com> <20150617171257.11fe405d@nial.brq.redhat.com> <20150617173736-mutt-send-email-mst@redhat.com> <20150617180921.7972345d@igors-macbook-pro.local> <20150617182917-mutt-send-email-mst@redhat.com> <5581A0E4.6050100@redhat.com> <20150617183413-mutt-send-email-mst@redhat.com> In-Reply-To: <20150617183413-mutt-send-email-mst@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/06/2015 18:34, Michael S. Tsirkin wrote: > On Wed, Jun 17, 2015 at 06:31:32PM +0200, Paolo Bonzini wrote: >> >> >> On 17/06/2015 18:30, Michael S. Tsirkin wrote: >>> Meanwhile old tools are vulnerable to OOM attacks. >> >> For each vhost device there will be likely one tap interface, and I >> suspect that it takes way, way more than 16KB of memory. > > That's not true. We have a vhost device per queue, all queues > are part of a single tap device. s/tap/VCPU/ then. A KVM VCPU also takes more than 16KB of memory. Paolo