From: Arjan van de Ven <arjanv@redhat.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] s390 (9/9): no timer interrupts in idle.
Date: Thu, 22 Apr 2004 12:56:25 +0200 [thread overview]
Message-ID: <20040422105625.GA27339@devserv.devel.redhat.com> (raw)
In-Reply-To: <OF99EB5E0C.21B30690-ONC1256E7E.003B1339-C1256E7E.003BCEE8@de.ibm.com>
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On Thu, Apr 22, 2004 at 12:53:15PM +0200, Martin Schwidefsky wrote:
> active in idle, a "0" indicates that the HZ timer is switchted off.
> The semantic "the next tick is THIS many <ticks> from now" IHMO doesn't make
> any sense. Skipping ticks will have some really bad effects, e.g. if the xtime
> isn't up-to-date network packets will get incorrect time stamps, timer events
> will be delivered too late, etc.
why? Most hardware have an alternative time source for such time stamps.
Timer events *won't* be delivered too late, simply *because* the timer said
"don't bother checking back for X amount of time", so when that time has
expired (eg the delay) then the timer comparison tells the kernel "ok this
one is due now".
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next prev parent reply other threads:[~2004-04-22 11:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-22 10:53 [PATCH] s390 (9/9): no timer interrupts in idle Martin Schwidefsky
2004-04-22 10:56 ` Arjan van de Ven [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-04-29 8:24 Martin Schwidefsky
2004-04-29 12:06 ` Dipankar Sarma
2004-04-29 7:43 Martin Schwidefsky
2004-04-29 8:16 ` Dipankar Sarma
2004-04-23 8:48 Martin Schwidefsky
2004-04-22 14:56 Martin Schwidefsky
2004-04-28 19:07 ` Dipankar Sarma
2004-04-22 12:44 Martin Schwidefsky
2004-04-22 13:11 ` Arjan van de Ven
2004-04-23 3:32 ` George Anzinger
2004-04-22 12:14 Martin Schwidefsky
2004-04-22 12:25 ` Arjan van de Ven
2004-04-22 11:09 Martin Schwidefsky
2004-04-22 11:14 ` Arjan van de Ven
2004-04-22 8:55 Martin Schwidefsky
2004-04-22 8:48 Martin Schwidefsky
2004-04-22 8:52 ` Arjan van de Ven
[not found] <1Nt5d-84u-3@gated-at.bofh.it>
[not found] ` <1NwPD-2RW-37@gated-at.bofh.it>
[not found] ` <1NwPE-2RW-39@gated-at.bofh.it>
[not found] ` <1Nx8Y-3ev-15@gated-at.bofh.it>
2004-04-21 22:38 ` Andi Kleen
2004-04-21 18:52 Martin Schwidefsky
2004-04-21 21:58 ` Dipankar Sarma
2004-04-21 16:37 Martin Schwidefsky
2004-04-21 20:43 ` Dipankar Sarma
2004-04-21 20:46 ` Christoph Hellwig
2004-04-21 21:01 ` Dipankar Sarma
2004-04-21 16:31 Martin Schwidefsky
2004-04-21 16:32 ` Christoph Hellwig
2004-04-21 14:49 Martin Schwidefsky
2004-04-21 15:31 ` Christoph Hellwig
2004-04-22 8:02 ` Arjan van de Ven
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