Hi Lukasz,
On Tue, 2021-11-09 at 12:39 +0000, Lukasz Luba wrote:
Hi Ricardo,
On 11/6/21 1:33 AM, Ricardo Neri wrote:
From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Add a new netlink event to notify change in CPU capabilities in
terms of
performance and efficiency.
Is this going to be handled by some 'generic' tools? If yes, maybe
the values for 'performance' might be aligned with capacity
[0,1024] ? Or are they completely not related so the mapping is
simply impossible?
That would have been very useful.
The problem is that we may not know the maximum performance as system
may be booting with few CPUs (using maxcpus kernel command line) and
then user hot adding them. So we may need to rescale when we get a new
maximum performance CPU and send to user space.
We can't just use max from HFI table at in instance as it is not
necessary that HFI table contains data for all CPUs.
If HFI max performance value of 255 is a scaled value to max
performance CPU value in the system, then this conversion would have
been easy. But that is not.