From mboxrd@z Thu Jan 1 00:00:00 1970 From: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= Subject: Re: Interrupt Bottom Half Scheduling Date: Tue, 15 Feb 2011 09:23:27 +0100 Message-ID: <20110215082327.GK13279@pengutronix.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-rt-users@vger.kernel.org To: Peter LaDow Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:48898 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752147Ab1BOIX3 (ORCPT ); Tue, 15 Feb 2011 03:23:29 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Mon, Feb 14, 2011 at 02:31:43PM -0800, Peter LaDow wrote: > How is the scheduling of the hrtimers softirq thread handled? >=20 > When querying the RT priority of the hrtimer softirq, I get a priorit= y > of 50. But when running a priority 99 thread, we still seem to be > getting interrupted. Shouldn't the hrtimer softirq be put off until > the CPU is idle or a lower priority task is running? The problem isn't just $(cat /proc/sys/kernel/sched_rt_runtime_us) bein= g smaller than $(/proc/sys/kernel/sched_rt_period_us)? Best regards Uwe --=20 Pengutronix e.K. | Uwe Kleine-K=F6nig = | Industrial Linux Solutions | http://www.pengutronix.de/= | -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html