From: "Chris Friesen" Subject: dhcp-based netboot over jumbo-frame network? Date: Wed, 08 Apr 2009 11:52:48 -0600 Message-ID: <49DCE470.9060109@nortel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org, Linux Network Development list Return-path: Received: from zrtps0kp.nortel.com ([47.140.192.56]:35641 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753568AbZDHRxJ (ORCPT ); Wed, 8 Apr 2009 13:53:09 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hi all, We have an existing system that loads a bare kernel using tftp, then mounts a rootfs via NFS. The wrinkle is that this is on a jumbo-frame enabled network, so somehow the MTU needs to be set before mounting the rootfs. In a previous version we patched ipconfig.c to support the DHCP option to specify the MTU value, but I'm wondering about the "proper" way to do this on current kernels. I suppose the obvious answer would be initramfs. The downsides to that solution are that it would increase the size of the kernel file, and we would need to change the existing build system. In the face of a small patch to ipconfig, it's not a very attractive solution. Looking forward to your responses. Chris