Date: Mon, 11 Jan 2010 11:40:28 -0800 From: Chuck Swiger <cswiger@mac.com> To: Paul Halliday <paul.halliday@gmail.com> Cc: questions@freebsd.org Subject: Re: FreeBSD 8.0, HyperV and non-uniform processors. Message-ID: <B6D1958E-746E-499C-B498-AFBDBF096C72@mac.com> In-Reply-To: <2dab70a31001111043kd6bb6b4u5062a3a4b4106b5@mail.gmail.com> References: <2dab70a31001111043kd6bb6b4u5062a3a4b4106b5@mail.gmail.com>
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Hi--
On Jan 11, 2010, at 10:43 AM, Paul Halliday wrote:
> Is this warning as harmful as it sounds:
>
> WARNING: Non-uniform processors.
> WARNING: Using suboptimal topology.
>
> More info:
>
> CPU: Intel(R) Xeon(R) CPU E7330 @ 2.40GHz (2304.83-MHz 686-class CPU)
> ACPI APIC Table: <VRTUAL MICROSFT>
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 0 package(s) x 4 core(s)
> cpu0 (BSP): APIC ID: 0
> cpu1 (AP): APIC ID: 1
> WARNING: Non-uniform processors.
> WARNING: Using suboptimal topology.
>
> Unfortunately I am forced to use this setup. Is there anything I can
> do? Should I even be worried?
This comes from the SMP probing code in i386/i386/mp_machdep.c (and similar for amd64):
if (mp_ncpus % (cpu_cores * cpu_logical) != 0) {
printf("WARNING: Non-uniform processors.\n");
printf("WARNING: Using suboptimal topology.\n");
return (smp_topo_none());
}
smp_topo_none() means that the system assumes none of the L1/L2 cache levels are shared; for a virtual machine, this is probably correct, so you should not be unduly concerned.
--
-Chuck
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