From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [BUG #12364] Re: HTB - very bad precision? HFSC works fine! 2.6.28 Date: Mon, 12 Jan 2009 23:28:11 -0800 Message-ID: <20090112232811.46100689@extreme> References: <1935.87.196.72.187.1231371721.squirrel@webmail.decimal.pt> <200901122038.05199.denys@visp.net.lb> <200901122201.19616.denys@visp.net.lb> <496C198A.4060502@trash.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Denys Fedoryschenko , Jesper Dangaard Brouer , netdev , bugme-daemon@bugzilla.kernel.org To: Patrick McHardy Return-path: Received: from mail.vyatta.com ([76.74.103.46]:42104 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751932AbZAMH2O (ORCPT ); Tue, 13 Jan 2009 02:28:14 -0500 In-Reply-To: <496C198A.4060502@trash.net> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 13 Jan 2009 05:33:14 +0100 Patrick McHardy wrote: > Denys Fedoryschenko wrote: > > They are enabled > > > > Router-Dora /config # zcat /proc/config.gz |grep HIGH_RES > > CONFIG_HIGH_RES_TIMERS=y > > Router-Dora /config # zcat /proc/config.gz |grep HZ > > CONFIG_NO_HZ=y > > Its odd that HZ=1000 solved the problem despite HR timers being active. > Are you sure they're actually enabled? You should see something like > this in the ringbuffer: > > [ 0.241972] Switched to high resolution mode on CPU 0 > [ 0.242708] Switched to high resolution mode on CPU 1 > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html Even with NO_HZ the regular kernel won't schedule timers sooner than HZ. I believe it caused regressions so it was disabled.