Thank you for the advice. The version I'm using was just checked out last week so it should be fine.
With regards to your other comment- is there any issue with using detailed? If my understanding is correct, it's just an agressive, modern OoO core and arm_detailed is the same, with some parameters set to be closer to an ARM Cortex-15? On Feb 20, 2013 5:51 AM, "Andreas Hansson" <[email protected]> wrote: > Hi Gabriel, > > It should be using the DDR3-1600 config if you have an up-to-date > version of gem5 (see configs/common/FSConfig.py) > > As a minor note, you might want to use arm_detailed as your CPU > (depending on what it is you are trying to model). > > Check the config.ini to be sure. > > Andreas > > From: Gabriel Yessin <[email protected]> > Reply-To: gem5 users mailing list <[email protected]> > Date: Wednesday, 20 February 2013 10:18 > To: gem5 users mailing list <[email protected]> > Subject: Re: [gem5-users] DDR Inaccuracies? > > Is SimpleDRAM used by default? > > For example, I ran my simulations with: > > ./build/ARM/gem5.fast -v --dump-config=config.ini --outdir=m5out > configs/example/fs.py -b bbench-gb > --kernel=/home/gyessin/dist/m5/system/binaries/vmlinux.smp.mouse.arm > --frame-capture --checkpoint-dir=checkpoint > --disk-image=/home/gyessin/dist/m5/system/disks/ARMv7a-Gingerbread-Android.SMP.mouse.nolock.img > --caches --cpu-type=detailed --l1d_size=32kB --l1i_size=32kB --l2cache > --l2_size=2048kB --clock=0.75GHz > > Everything was configured using the instructions at > http://www.m5sim.org/Bbench-gem5 and the basic setup/install > instructions at http://gem5.org/Introduction. > > Would this have utilized SimpleDRAM or SimpleMemory? > > Thank you so much for your quick response. > > On Wed, Feb 20, 2013 at 3:54 AM, Andreas Hansson > <[email protected]>wrote: > >> Hi Gabriel, >> >> This was written when the only memory model available was SimpleMemory >> that models fixed latency (and now also bandwidth). If you replace this >> with SimleDRAM you get a DRAM controller with tuneable timing constraints. >> Examples provided include DDR3-1600 and LPDDR2-S4-1066, but if you want you >> can dial in any imaginable DDR memory. >> >> In short: Yes there is a very simple way to account for it these days. >> >> Andreas >> >> From: Gabriel Yessin <[email protected]> >> Reply-To: gem5 users mailing list <[email protected]> >> Date: Wednesday, 20 February 2013 05:58 >> To: gem5-users <[email protected]> >> Subject: [gem5-users] DDR Inaccuracies? >> >> I was wondering if the issues discussed here were ever addressed - >> from "Accuracy evaluation of GEM5 simulator system" >> >> "According to the results, the accuracy varies from 1.39% to 17.94% >> depending on the memory traffic. In the worst scenario, mismatch has been >> shown to result from overly simple model of the external DDR memory in GEM5 >> that does not fairly model DRAM specifics." >> >> "This originates from a somewhat inaccurate model of the external DDR >> memory for which GEM5 models latency for each access and >> an optional random spread factor, therefore abstracting actual DDR >> complex access patterns." >> >> Or is there any way to account for this mismatch? >> >> Thank you, >> Gabriel >> >> -- IMPORTANT NOTICE: The contents of this email and any attachments are >> confidential and may also be privileged. If you are not the intended >> recipient, please notify the sender immediately and do not disclose the >> contents to any other person, use it for any purpose, or store or copy the >> information in any medium. Thank you. >> >> _______________________________________________ >> gem5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> > > > > -- > Gabriel Yessin > B.S. Biomedical Engineering, May 2011 > M.S. Computer Engineering, May 2013 > The George Washington University > 774.238.0101 > > -- IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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