Re: [PATCH v7 1/4] spinlock: A new lockref structure for locklessupdate of refcount

[Linus Torvalds]

On Fri, Aug 30, 2013 at 10:17 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> Yeah, silent basically limits you to i7 single socket systems and sadly
> Intel doesn't seem to want to make those with more than 4 cores on :/

Yup. And even if they had more cores in a single socket, the real
scalability issues won't happen until you start crossing sockets and
serialization slows down by a big amount due to cachelines moving
outside the die.

> I've got a i7-K part (SNB iirc) with a _huge_ scythe cooler and a high
> efficiency fanless PSU for a system that's near noiseless -- as in my
> Thinkpad actually makes more noise.

I've got a 4770S on order, it should arrive tomorrow. It's the 65W
part, and it has TSX. But no, I doubt I'll see any real scalability
issues with it, but at least I can test any TSX codepaths.

                  Linus
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