linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

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

On Fri, Aug 30, 2013 at 10:17 AM, Peter Zijlstra <peterz@...radead.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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