From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux_kvm@proinbox.com Subject: Re: NIC limit Date: Thu, 07 Oct 2010 14:03:18 -0400 Message-ID: <1286474598.22696.1398904427@webmail.messagingengine.com> References: <20101006101931.0DFC04B2@gateway1.messagingengine.com><1286360484.21399.1398635889@webmail.messagingengine.com> <20101006171817.GE18885@sequoia.sous-sol.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Chris Wright" Return-path: Received: from out5.smtp.messagingengine.com ([66.111.4.29]:56895 "EHLO out5.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751180Ab0JGSDT (ORCPT ); Thu, 7 Oct 2010 14:03:19 -0400 In-Reply-To: <20101006171817.GE18885@sequoia.sous-sol.org> Sender: kvm-owner@vger.kernel.org List-ID: >The PCI bus has only 32 slots (devices), 3 taken by chipset + vga, and >a 4th if you have, for example, a virtio disk. Are you sure these are >33 PCI devices and not 33 PCI functions? No, not sure. Apparently my statement was based on an uninformed assumption. I tested using a VM that had 30 (removable-per-web-interface) attachments, and added 3x IDE HDDs to bring it above what I thought was 32 devices: 28 virtio NICs 1 IDE CD-ROM 1 virtio HDD +3 IDE HDDs I could add IDE up past 32 and it would start, as soon as there were more than 28 NICs with or without the 3 IDE HDDs, start would fail. On Wed, 06 Oct 2010 10:18 -0700, "Chris Wright" wrote: > * linux_kvm@proinbox.com (linux_kvm@proinbox.com) wrote: > > Hi again everybody, > > > > One of the admins at the ProxmoxVE project was gracious enough to > > quickly release a package including the previously discussed change to > > allow up to 32 NICs in qemu. > > You mean they patched qemu to increase the MAX_NICS constant? Nice to > get the quick turn around. > > Te better choice is to use a newer command line. Not only does it avoid > the MAX_NICS limitation, but it also enables standard virtio-net offload > accelerations. > > > For future reference the .deb is here: > > ftp://download.proxmox.com/debian/dists/lenny/pvetest/binary-amd64/pve-qemu-kvm_0.12.5-2_amd64.deb > > > > Upon creating & running the VM with the newly patched qemu-kvm app > > installed, I found a NIC limitation remained in place, presumably > > imposed by some other aspect of the environment. > > > > The machine would start when it had 33 PCI devices, as long as no more > > than 28 of them were NICs. > > The PCI bus has only 32 slots (devices), 3 taken by chipset + vga, and > a 4th if you have, for example, a virtio disk. Are you sure these are > 33 PCI devices and not 33 PCI functions? > > thanks, > -chris >