Date: Wed, 10 Nov 2010 12:20:45 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Cc: freebsd-smp@freebsd.org Subject: Re: kern.smp.topology Message-ID: <ibdv6d$kcc$1@dough.gmane.org> In-Reply-To: <20101110125630.00548b45@ukr.net> References: <20101110125630.00548b45@ukr.net>
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On 11/10/10 11:56, Ivan Klymenko wrote: > Hello! People. > > Who can explain the purpose of sysctl variable kern.smp.topology? > What does it affect? > > It may take such values: > 1 -Dual core with no sharing. > 2 -No topology, all cpus are equal. > 3 -Dual core with shared L2. > 4 -quad core, shared l3 among each package, private l2. > 5 -quad core, 2 dualcore parts on each package share l2. > 6 -Single-core 2xHTT > 7 -quad core with a shared l3, 8 threads sharing L2. > default-Default, ask the system what it wants. > > Does it make sense to set its value manually, if I know that my CPU Core2Duo? > How to do this, select a value? > > I not found this explanation in any of the official guides ... Short answer is: you should not have to touch it, ever. Long answer: it's used mostly for testing ULE and debugging topology-related problems. It's even less relevant in recent kernels (9, 8-stable) where a better topology parser has been committed.
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