Date: Mon, 4 May 2009 09:41:00 -0400 From: John Baldwin <jhb@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r191766 - in head/sys: amd64/include amd64/isa i386/bios i386/include i386/isa i386/xen isa pc98/cbus Message-ID: <200905040941.00641.jhb@freebsd.org> In-Reply-To: <200905031747.n43HlLHD020054@svn.freebsd.org> References: <200905031747.n43HlLHD020054@svn.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sunday 03 May 2009 1:47:21 pm Alexander Motin wrote: > Author: mav > Date: Sun May 3 17:47:21 2009 > New Revision: 191766 > URL: http://svn.freebsd.org/changeset/base/191766 > > Log: > Rename statclock_disable variable to atrtcclock_disable that it actually is, > and hide it inside of atrtc driver. Add new tunable hint.atrtc.0.clock > controlling it. Setting it to 0 disables using RTC clock as stat-/ > profclock sources. > > Teach i386 and amd64 SMP platforms to emulate stat-/profclocks using i8254 > hardclock, when LAPIC and RTC clocks are disabled. > > This allows to reduce global interrupt rate of idle system down to about > 100 interrupts per core, permitting C3 and deeper C-states provide maximum > CPU power efficiency. Note that IRQ0 is not going to work for many systems with the local APIC since I removed the mixed-mode handling from the x86 interrupt code. -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200905040941.00641.jhb>