Date: Thu, 17 Apr 2008 19:07:50 -0700 From: Julian Elischer <julian@elischer.org> To: obrien@freebsd.org, Andrew Gallatin <gallatin@cs.duke.edu>, gnn@freebsd.org, freebsd-current@freebsd.org Subject: Re: TSC Timecounter and multi-core/SMP Message-ID: <48080276.3040203@elischer.org> In-Reply-To: <20080418003203.GB11705@dragon.NUXI.org> References: <m2d4oy8n30.wl%gnn@neville-neil.com> <18431.23276.913397.188219@grasshopper.cs.duke.edu> <20080418003203.GB11705@dragon.NUXI.org>
next in thread | previous in thread | raw e-mail | index | archive | help
David O'Brien wrote: > > The TSC on K8 is not invariant - its rate of change is affected by > P-state changes. > > The TSC on Greyhound (Family 10h) is invariant. > [but as stated above, is not synced with other cores] You'd think that an invariant sync'd clock (fast to read) of some type would have been done by someone by now.. The software people have been asking for this for the last decade at least. >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?48080276.3040203>