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Date: Sun, 20 Sep 2009 20:30:48 +0200 From: Arjan van de Ven <arjan@...radead.org> To: Robert Hancock <hancockrwd@...il.com> Cc: Junhee Lee <junhee@...sys.kaist.ac.kr>, linux-kernel@...r.kernel.org Subject: Re: microsecond event scheduling in an application On Sun, 20 Sep 2009 12:26:09 -0600 Robert Hancock <hancockrwd@...il.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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