Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
From: Peter Zijlstra <peterz@infradead.org>
Date: 2019-09-26 09:07:46
Also in:
linux-alpha, linux-mips, linux-s390, linux-sh, lkml, sparclinux
On Wed, Sep 25, 2019 at 11:45:26PM +0200, Peter Zijlstra wrote:
[ 7.149889] [Firmware Bug]: device: 'pci0000:7f': no node assigned on NUMA capable HW [ 7.882888] [Firmware Bug]: device: 'pci0000:ff': no node assigned on NUMA capable HW
Going by the limited number of intel numa boxes I have, it looks like: socket = (~busid) >> (8-n) where 'n' is the number of bits required to encode the largest socket id, ie 1 for 2-socket and 2 for 4 socket. For 8 socket systems we start using pci domains, and things get more 'interesting' :/