From: Ingo Molnar <mingo@elte.hu>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>, akpm@osdl.org, linux-arch@vger.kernel.org
Subject: Re: [patch 1/1] Fix spinlock debugging delays to not time out too early
Date: Tue, 7 Feb 2006 20:14:18 +0100 [thread overview]
Message-ID: <20060207191418.GA28414@elte.hu> (raw)
In-Reply-To: <20060207184435.GA18589@agluck-lia64.sc.intel.com>
* Luck, Tony <tony.luck@intel.com> wrote:
> On Tue, Feb 07, 2006 at 07:29:24PM +0100, Andi Kleen wrote:
> > For this case that would be ok, as long as it isn't a hour or so,
> > but let's say < 1 minute.
>
> About 9.7 seconds on ia64 for:
>
> for (i = 0; i < loops_per_jiffy * HZ; i++) {
> __delay(1);
> }
>
> so yes, well under a minute.
yeah, that's good enough. We want to have a minimum delay of 1 second,
because otherwise we'd be getting false positives under high load (and
under some bad drivers). Having a larger delay is not an issue, as long
as it's below the average hit-reset latency of users ;)
i'd expect the HPET-based __delay(1) to be the heaviest.
Ingo
next prev parent reply other threads:[~2006-02-07 19:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-07 18:20 [patch 1/1] Fix spinlock debugging delays to not time out too early Luck, Tony
2006-02-07 18:29 ` Andi Kleen
2006-02-07 18:44 ` Luck, Tony
2006-02-07 19:14 ` Ingo Molnar [this message]
2006-02-07 19:37 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-02-07 17:41 akpm
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