From: Dominik Brodowski <linux-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org>
To: Dino Klein <dinoklein-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Entering C3 Processor State without a Bus Arbiter
Date: Fri, 16 Jan 2004 00:25:15 +0100 [thread overview]
Message-ID: <20040115232515.GA5386@dominikbrodowski.de> (raw)
In-Reply-To: <Law11-OE36TK4GXSNMh0000bd93-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
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On Thu, Jan 15, 2004 at 05:29:23PM -0500, Dino Klein wrote:
> Hello,
>
> I'm curios as to why the implementation does not enter C3 without the presence of a Bus Arbiter; also, how come a comment in the
> source claims that C3/WBINVD is too expensive?
[ /me shuffles in some old directories and finds a file called wbinvd_analysis ]
I'd investigated this a couple of months ago. It turned out to hang my
(previous) notebook every once in a while; I think that was the reason I
aborted the patch...
The average cost of a wbinvd instruction was 98us, the minimum cost 22us.
However, the maximum cost was a horrible 780us. The average sleeping time
of C3 was 519us, minimum 0us...
This is discussed in detail in these threads:
http://marc.theaimsgroup.com/?l=acpi4linux&m=101630988127506&w=2
http://marc.theaimsgroup.com/?l=acpi4linux&m=101662029010850&w=2
other threads (including my patches) can be found by searching for "wbinvd"
in this archive.
Dominik
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next prev parent reply other threads:[~2004-01-15 23:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-15 22:29 Entering C3 Processor State without a Bus Arbiter Dino Klein
[not found] ` <Law11-OE36TK4GXSNMh0000bd93-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
2004-01-15 23:25 ` Dominik Brodowski [this message]
2004-01-15 23:52 ` Nate Lawson
[not found] ` <20040115154555.V73140-Y6VGUYTwhu0@public.gmane.org>
2004-01-16 9:30 ` Dominik Brodowski
[not found] ` <20040116093055.GE9814-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org>
2004-01-16 17:33 ` Nate Lawson
[not found] ` <20040116092917.W76365-Y6VGUYTwhu0@public.gmane.org>
2004-01-16 18:02 ` Dominik Brodowski
[not found] ` <20040116180225.GB5090-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org>
2004-01-18 3:00 ` Ducrot Bruno
2004-01-17 18:11 ` Dino Klein
-- strict thread matches above, loose matches on Subject: below --
2004-01-18 7:14 Yu, Luming
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