linux-kernel - Re: Fwd: x86_64 and AMD with C1E

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Message-ID: <20071001143225.GA19797@one.firstfloor.org>
Date:	Mon, 1 Oct 2007 16:32:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Mikhail Kshevetskiy <mikhail.kshevetskiy@...il.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: Fwd: x86_64 and AMD with C1E

> There is work in progress on a patch, which allows to utilize the hpet
> timers as per cpu timers. This should solve the problem. Be patient.

Given that e.g. ICH8 only has 3 HPET timers that seems doubtful
except for the special case of single-socket non hyper threaded dual core.
You'll probably do a lot of broadcasting and IPI'ing still.

Also you'll likely make user space unhappy which often requires 
at least one free HPET timer for /dev/rtc. Ok I suppose that 
could be replaced with a hrtimer.

-Andi
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