> Just curious, what happens when you switch the order of the rdmsr > (MPERF > before APERF), same result? >
The results are similar even if you swap the "order of reads". This means that the order of reads will not affect the ratio. -vinay ----- Original Message ----- From: Eric Saxe <[email protected]> Date: Wednesday, July 23, 2008 1:18 pm Subject: Re: [tesla-dev] Experiment Results on APERF/MPERF registers - Need Clarification To: Vinay Devadas <Vinay.Devadas at Sun.COM> Cc: tesla-dev at opensolaris.org > Vinay Devadas wrote: > > By the way, I am taking care to make the 2 reads happens as quickly > as possible, > > spl_high() > > rdmsr (APERF) > > rdmsr (MPERF) > > spl0() > > > > Please let me know of any suggestions/explanations possible. > > > Just curious, what happens when you switch the order of the rdmsr > (MPERF > before APERF), same result? > > -Eric
