netdev - Re: [BUG #12364] Re: HTB - very bad precision? HFSC works fine! 2.6.28

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Message-ID: <20090112232811.46100689@extreme>
Date:	Mon, 12 Jan 2009 23:28:11 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Denys Fedoryschenko <denys@...p.net.lb>,
	Jesper Dangaard Brouer <hawk@...u.dk>,
	netdev <netdev@...r.kernel.org>, bugme-daemon@...zilla.kernel.org
Subject: Re: [BUG #12364] Re: HTB - very bad precision? HFSC works fine!
 2.6.28

On Tue, 13 Jan 2009 05:33:14 +0100
Patrick McHardy <kaber@...sh.net> 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
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Even with NO_HZ the regular kernel won't schedule timers sooner
than HZ. I believe it caused regressions so it was disabled.
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