Messages in this thread | | | From | "Junhee Lee" <> | Subject | RE: microsecond event scheduling in an application | Date | Tue, 22 Sep 2009 15:35:09 +0900 |
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Thanks Arjan van de Ven. Your comment is very useful to me. Now I am trying to solve microsecond events scheduling using hrtimer.
-----Original Message----- From: Arjan van de Ven [mailto:arjan@infradead.org] Sent: Monday, September 21, 2009 3:31 AM To: Robert Hancock Cc: Junhee Lee; linux-kernel@vger.kernel.org Subject: Re: microsecond event scheduling in an application
On Sun, 20 Sep 2009 12:26:09 -0600 Robert Hancock <hancockrwd@gmail.com> wrote:
> On 09/08/2009 08:27 AM, Junhee Lee wrote: > > I am working on event scheduler which handles events in microsecond > > level. Actual this program is a network emulator using simulation > > codes. I'd like to expect that network emulator is working as > > simulation behaviors. Thus high resolution timer interrupt is > > required. But high resolution timer interrupt derived by high tick > > frequency (jiffies clock) must effect the system performance. > > Are there any comments or ways to support microsecond event > > scheduling without performance degradation? > > Just increasing HZ will degrade performance, yes, but we have > hrtimers now which should be able to use granularities smaller than > one jiffy, so it shouldn't be needed..
select/poll use hrtimers, which are jiffies independent....
you'll be hard pressed to notice jiffies granularity in userspace nowadays..
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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