Hi Shaokun,
On 2020-01-14 14:20, Shaokun Zhang wrote:
Hi Marc,
On activation, VMAPP command is followed by a VINVALL, which could be
quite expensive for the start-up of virtual machine. If a vpeid is
allowed
successfully, it is not used in system.
How expensive? This is exactly similar to what happens on a physical
machine
where we perform an INVALL on MAPC. And yet you don't complain about
that.
Please provide numbers.
We may consider put VINVALL to deactivation to ensure all cache of
certain
vpeid is invalid, to simplify activation. We consider start-up may be
more
common and more time-consuming-sensitive than shutdown process.
In my world, they cost the same thing, and happen just as often. Also, I
want
guarantees that on VMAPP, there is no stale information even if this is
the
first time we're using this VPEid (who knows what happens over kexec,
for
example).
Do you think it's all right?
I don't, for the reasons stated above. You also provide no numbers
showing
how bad the overhead is, so I'm left guessing.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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