Thanks for pointing out this issue... Is there any other changes in default configuration you wanna mention to simulate Nehalem like architecture ?
On Wed, Aug 22, 2012 at 10:54 AM, avadh patel <[email protected]> wrote: > > > On Wed, Aug 22, 2012 at 2:16 AM, Yongbing Huang > <[email protected]>wrote: > >> Hi,**** >> >> ** ** >> >> In the cache configuration files such as l2_cache.conf, there is >> a parameter “LATENCY” for each level. What is the unit of the parameter, >> CPU cycle or ns? I guess it is CPU cycle for caches, and ns for memory >> option after reading the source codes. If I am right, the latencies for L2 >> (5 cycles) and L3 cache (8 cycles) shown in the example configuration, have >> big difference from real machine which are about 10 cycles for L2 cache and >> about 38 cycles in Nehalem architecture. Since most people use the default >> configuration, it is valuable to make sure of this issue.**** >> >> ** >> > > Yes they are CPU cycles. Can you share the document/webpage from where you > get 10 cycles and 38 cycles for nehalem? We have done some calibration on > real hardware and simulator using lmbench and found out that configuration > L2 with 6 cycles and L3 (12MB) with 27 cycles matches very well. Remember > that in marss cache latency are not flat, meaning that these latency only > represent delay in accessing cache storage, on top of that each cache > access has variable dynamic delay of queuing, port access and dependency > management. > > Thanks for pointing out these values, in next release we will release > 'nehalem' config file that try to model nehalem architecture map some of > the delays from our study. > > - Avadh > >> ** >> >> Thanks.**** >> >> ** ** >> >> -Yongbing Huang**** >> >> _______________________________________________ >> http://www.marss86.org >> Marss86-Devel mailing list >> [email protected] >> https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel >> >> > > _______________________________________________ > http://www.marss86.org > Marss86-Devel mailing list > [email protected] > https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel > >
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