A bug was recently found in the bimodal predictor. If you are still looking at this, you might want to try a new checkout. Hope this helps.
On Wed, Jul 2, 2014 at 4:52 PM, Zi Yan via gem5-dev <[email protected]> wrote: > I get 5 100-million-instruction simpoints for each benchmark in > SPEC CPU 2006 with *ref input*. I am using cross-tool > arm-cortex_a15-linux-gnueabi-gcc version 4.8.2 to compile. > > For gcc, I got from 0.2% to 5% miss rate from tournament, but 3% to 22% > miss rate from bi-mode cross all simpoints. > > Most weird part is hmmer, I got from 0.3% to 0.5% miss rate from > tournament, > but 52% to 60% miss rate from bi-mode. > > > > -- > Best Regards > Yan Zi > > On 2 Jul 2014, at 17:11, Anthony Gutierrez via gem5-dev wrote: > > > This could depend on a lot of factors. How are you running the > benchmarks? > > > > E.g., running SPEC 2k6's gcc to completion with the train input set in FS > > mode yields a 6.45% miss rate for bi-mode, while the tournament predictor > > yields a 7.12% miss rate. > > > > > > Anthony Gutierrez > > http://web.eecs.umich.edu/~atgutier > > > > > > On Wed, Jul 2, 2014 at 4:37 PM, Zi Yan via gem5-dev <[email protected]> > > wrote: > > > >> Hi, > >> > >> I just updated gem5-dev and got bi-mode as ARM's default > >> branch predictor. > >> > >> I got mis-prediction rate > >> > (system.cpu.branchPred.condIncorrect/system.cpu.branchPred.condPredicted) > >> ranging from 10% to 60%, whereas I saw mis-prediction rate ranging > >> from 1% to 9% with tournament for SPEC CPU 2006 benchmarks. > >> > >> Should I expect this from bi-mode? > >> > >> Thanks. > >> > >> -- > >> Best Regards > >> Yan Zi > >> _______________________________________________ > >> gem5-dev mailing list > >> [email protected] > >> http://m5sim.org/mailman/listinfo/gem5-dev > >> > > _______________________________________________ > > gem5-dev mailing list > > [email protected] > > http://m5sim.org/mailman/listinfo/gem5-dev > _______________________________________________ > gem5-dev mailing list > [email protected] > http://m5sim.org/mailman/listinfo/gem5-dev > _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
