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Date: Fri, 30 Aug 2013 10:28:58 -0700
Message-ID: <CA+55aFzYrCbJ78XVKk7Apkxa+F-gpE911zTpMnSoGsn4S+CdpA@mail.gmail.com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Waiman Long <Waiman.Long@hp.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jeff Layton <jlayton@redhat.com>, Miklos Szeredi <mszeredi@suse.cz>,
        Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>, Andi Kleen <andi@firstfloor.org>,
        "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        "Norton, Scott J" <scott.norton@hp.com>
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On Fri, Aug 30, 2013 at 10:17 AM, Peter Zijlstra <peterz@infradead.org> 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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