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Date: Fri, 20 Feb 2009 20:40:54 +0100 From: Ingo Molnar <mingo@...e.hu> To: Suresh Siddha <suresh.b.siddha@...el.com> Cc: Nick Piggin <npiggin@...e.de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Oleg Nesterov <oleg@...hat.com>, Jens Axboe <jens.axboe@...cle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Rusty Russell <rusty@...tcorp.com.au>, Steven Rostedt <rostedt@...dmis.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, steiner@....com Subject: Re: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many()) * Suresh Siddha <suresh.b.siddha@...el.com> wrote: > > So the question is, is an SFENCE there enough to serialize > > the WRMSR with previous memory-writes? It's not specified in > > the x2apic docs as far as i could see. > > No. sfence is not enough (wrmsr to x2apic regs was still > passing ahead). We have done a small experiment to demonstrate > the issue and adding mfence fixes the issue but not sfence. We > need a serializing instruction or mfence. I will try to get > the SDM updated. Fair enough! Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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