Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932275AbbFQQlp (ORCPT ); Wed, 17 Jun 2015 12:41:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36872 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754970AbbFQQla (ORCPT ); Wed, 17 Jun 2015 12:41:30 -0400 Date: Wed, 17 Jun 2015 18:41:27 +0200 From: "Michael S. Tsirkin" To: Paolo Bonzini Cc: Igor Mammedov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH 3/5] vhost: support upto 509 memory regions Message-ID: <20150617183936-mutt-send-email-mst@redhat.com> References: <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> <5581A281.4000308@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5581A281.4000308@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1096 Lines: 33 On Wed, Jun 17, 2015 at 06:38:25PM +0200, Paolo Bonzini wrote: > > > 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 That's up to you as a kvm maintainer :) People are already concerned about vhost device memory usage, I'm not happy to define our user/kernel interface in a way that forces even more memory to be used up. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/