[Info-vax] What would be involved in moving RMS into kernel mode ?

[Simon Clubley]

On 2023-05-04, Chris Townley <news at cct-net.co.uk> wrote:
> On 04/05/2023 21:57, Stephen Hoffman wrote:
>> On 2023-05-02 13:24:00 +0000, Simon Clubley said:
>> 
>>> If the emulated executive mode is a major reason for the kernel 
>>> overheads we are seeing on x86-64 VMS, what would be involved in 
>>> moving RMS from executive mode directly into kernel mode ?
>> 
>> If you're going to blue-sky this, move RMS and the XQP into a user-mode 
>> process, preferably with zero-copy buffering.
>> 
>> Whether a solitary process or replicated processes would depend on 
>> complexity, aggregate system load, and available cores.
>> 
>> Yeah, I know, I'm making a mach-ery of the existing two-by-two version 
>> of the four-mode design.
>> 
>> But pragmatically, VSI has a few billion projects in the queue ahead of 
>> re-architecting the RMS and XQP giblets.
>> 
>> 
>
> I am sure Hein is available
>

Who is he ? :-)

On a more serious note, I've received private email pointing out that
there may be an issue with PPFs if running RMS in user mode.

I also wonder how global buffers might be affected by user-mode RMS.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.