Message-ID: <43835D01.3020304@nortel.com>
Date: Tue, 22 Nov 2005 12:01:37 -0600
From: "Christopher Friesen" <cfriesen@nortel.com>
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To: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
CC: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
       linux-kernel@vger.kernel.org, "Paul E. McKenney" <paulmck@us.ibm.com>,
       "K.R. Foley" <kr@cybsft.com>, Thomas Gleixner <tglx@linutronix.de>,
       pluto@agmk.net, john cooper <john.cooper@timesys.com>,
       Benedikt Spranger <bene@linutronix.de>,
       Daniel Walker <dwalker@mvista.com>,
       Tom Rini <trini@kernel.crashing.org>,
       George Anzinger <george@mvista.com>
Subject: Re: test time-warps [was: Re: 2.6.14-rt13]
References: <20051115090827.GA20411@elte.hu>	 <1132608728.4805.20.camel@cmn3.stanford.edu>	 <20051121221511.GA7255@elte.hu> <20051121221941.GA11102@elte.hu>	 <Pine.LNX.4.58.0511212012020.5461@gandalf.stny.rr.com>	 <20051122111623.GA948@elte.hu> <1132681766.21797.10.camel@cmn3.stanford.edu>
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Fernando Lopez-Lezcano wrote:

>>Basically if there is an observable and provable warp in the TSC output 
>>then it must not be used for any purpose that is not strictly 
>>per-CPU-ified (such as userspace threads bound to a single CPU, and the 
>>TSC never used between threads).

> Apparently that's the case.

What about periodically re-syncing the TSCs on the cpus?  Are they 
writeable?

Chris

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