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Date: Tue, 21 Oct 2008 12:10:58 -0600 From: Bjorn Helgaas <bjorn.helgaas@...com> To: "H. Peter Anvin" <hpa@...or.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, john stultz <johnstul@...ibm.com>, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, "Luck, Tony" <tony.luck@...el.com>, Steven Rostedt <rostedt@...dmis.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Thomas Gleixner <tglx@...utronix.de>, David Miller <davem@...emloft.net>, Ingo Molnar <mingo@...hat.com> Subject: Re: [RFC patch 15/15] LTTng timestamp x86 On Monday 20 October 2008 04:29:07 pm H. Peter Anvin wrote: > Linus Torvalds wrote: > > > > But it's not going to solve the "hey, I have 512 CPU's, they are all on > > different boards, and no, they are _not_ synchronized to one global > > clock!". > > > > That's why I'd suggest making _purely_ local time, and then aiming for > > something NTP-like. But maybe there are better solutions out there. > > At the same time, it would definitely be nice to encourage vendors of > large SMP systems to provide a common root crystal (frequency standard) > for a single SMP domain. Preferrably a really good one, TCXO or better. A single root crystal is nice for us software guys. But it often also turns into a single point of failure, which the hardware guys are always trying to eliminate. So I think multiple crystals are inevitable for the really large machines. Bjorn -- 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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