Date: Thu, 1 Jun 2006 14:41:07 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Jeremie Le Hen <jeremie@le-hen.org> Subject: Re: [fbsd] timer goes sluggish Message-ID: <200606011441.07494.jhb@freebsd.org> In-Reply-To: <20060530223226.GT1890@obiwan.tataz.chchile.org> References: <20060529153103.GA17178@obiwan.tataz.chchile.org> <20060530223226.GT1890@obiwan.tataz.chchile.org>
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On Tuesday 30 May 2006 18:32, Jeremie Le Hen wrote: > Hi, > > On Mon, May 29, 2006 at 05:31:03PM +0200, Jeremie Le Hen wrote: > > Hi, > > > > I won't write too much, the following session will tell much more: > > > > % jarjarbinks:root# ntpdate -b chronos.cru.fr > > % 29 May 17:08:44 ntpdate[4254]: step time server 195.220.94.163 offset 0.000273 sec > > % jarjarbinks:root# sysctl kern.timecounter.hardware > > % kern.timecounter.hardware: ACPI-fast > > % jarjarbinks:root# while : ; do date ; sleep 1 ; done > > % Mon May 29 17:08:56 CEST 2006 > > % Mon May 29 17:09:03 CEST 2006 > > % Mon May 29 17:09:09 CEST 2006 > > % Mon May 29 17:09:16 CEST 2006 > > % Mon May 29 17:09:22 CEST 2006 > > % ^C > > Sometimes, I feel dumb. > > I noticed that the clock sped up when the CPU makes heavy computing, > which meant there was some power saving on idleness. > > I dug a bit I found that hw.acpi.cpu.cx_lowest=C4. > Setting it hw.acpi.cpu.cx_lowest=C1 makes the clock goes ``in time'' :). If you are using APIC, try disabling APIC and see if it works ok with higher Cx states. -- John Baldwin
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