From: Wink Saville <wink@saville.com>
To: Robert Hancock <hancockr@shaw.ca>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjan@infradead.org>
Subject: Re: [patch] x86: unify/rewrite SMP TSC sync code
Date: Sun, 26 Nov 2006 00:16:47 -0800 [thread overview]
Message-ID: <45694D6F.60100@saville.com> (raw)
In-Reply-To: <4569404E.20402@shaw.ca>
Robert Hancock wrote:
>>>> Actually, we need to ask the CPU/System makers to provide a system wide
> Generally user mode code should just be using gettimeofday. When the TSC
> is usable as a sane time source, the kernel will use it. When it's not,
> it will use something else like the HPET, ACPI PM Timer or (at last
> resort) the PIT, in increasing degrees of slowness.
>
But gettimeofday is much too expensive compared to RDTSC.
Wink
next prev parent reply other threads:[~2006-11-26 8:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa./NRPJg+JjfSQLUVwnX1GpHGIojQ@ifi.uio.no>
[not found] ` <fa.Y0RKABHd+7qnbGQYBAGPvlJ0Qic@ifi.uio.no>
[not found] ` <fa.fD3WSpNqEJ4736vYzEak5Gf3xTw@ifi.uio.no>
[not found] ` <fa.A+gkQAO1DLThaxJxPLPl3yE1CGo@ifi.uio.no>
[not found] ` <fa.INurNKWdUKAEULTHyfpSW65a/Ng@ifi.uio.no>
[not found] ` <fa.n9vySiI9RS2MCl0DZPDzxZEPiFw@ifi.uio.no>
2006-11-26 7:20 ` [patch] x86: unify/rewrite SMP TSC sync code Robert Hancock
2006-11-26 8:16 ` Wink Saville [this message]
2006-11-26 8:24 ` Arjan van de Ven
2006-11-26 19:48 ` Wink Saville
2006-11-27 7:51 ` Arjan van de Ven
2006-11-27 9:15 ` Wink Saville
2006-11-27 17:23 Robert Crocombe
2006-11-27 18:41 ` Max Krasnyansky
-- strict thread matches above, loose matches on Subject: below --
2006-11-24 17:02 Ingo Molnar
2006-11-24 17:13 ` Andi Kleen
2006-11-24 20:25 ` Ingo Molnar
2006-11-24 20:37 ` Andi Kleen
2006-11-24 20:46 ` Ingo Molnar
2006-11-24 21:06 ` Andi Kleen
2006-11-24 22:48 ` Ben Greear
2006-11-25 2:56 ` Wink Saville
2006-11-25 8:30 ` Arjan van de Ven
2006-11-25 16:58 ` Wink Saville
2006-11-25 17:41 ` Arjan van de Ven
2006-11-25 20:34 ` Wink Saville
2006-11-27 19:00 ` Christoph Lameter
2006-11-29 7:13 ` Ingo Molnar
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