Mailing List Archived Message #175

From: "Massimo S." <> Full Headers
Undecoded message
Subject: Re: [Virtualized eCS] Vbox question and cores (AOS 503)
Date: Fri, 10 Dec 2021 21:48:32 +0100
To: Virtualized eCS Users Mailing List <>

Il 10/12/2021 18:20, Doug Bissett ha scritto:
On 2021-12-10, at 15:04:59, Massimo S. wrote:

Il 09/12/2021 21:16, Doug Bissett ha scritto:
On 2021-12-09, at 20:20:28, Massimo S. wrote:

Hi all,

is it possible to give 3 or 5 cores to an AOS503 guest VM?


Yes.  AFAIK, you can use up to the number of real cores. HOWEVER, using more than one core will cause problems,
never had one with ACPI
my production servers use 1, 2 or 4 cores, i never had one hang or trap

and it will likely not make much difference in performance (it makes very little difference when running a XP, or win 7,

no, sorry, they do if you are using real world production servers

>From what I see, VBox uses support similar to Hyper Threading, and Hyper Threading is not very friendly to OS/2.
Try it, and see what happens. I suspect that it will hang after a short period. I haven't tried it for a couple of years, something
may have changed (but I doubt it).

my production servers use 1, 2 or 4 cores, i never had a trap or hang or whatever
my only doubt was MP (3,5,7) not SMP number of cores

you didn't try that
ok, thanks anyway


I think you misunderstood. The VBox HOST can run under any number of cores (including Hyper Threading). Using the setting in VBox to use more than one core for an OS/2 GUEST will cause trouble because VBox seems to use the same thing that Hyper Threading uses. Hyper Threading is not completely compatible with the OS/2 job scheduler, and it will, cause OS/2 to hang, eventually (usually sooner, than later).


the host is WS2019 and the CPU is xeon 8 cores
i repeat, i don't have any issue using 2 or 4 cores in the gust machine
with ACPI (AN drv pack on ecs2.2b or AOS503)

maybe this happened with old builds of OS/2, dunno ecs 2.1 or older..


My comments about XP and 7, were about using multiple processors in the GUEST. It makes very little difference over running them with a single processor configured, but that may depend on exactly what you are doing with them.

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