I think you mean the TimingSimpleCPU, not the AtomicTimingCPU. Gabe
On Thu, Oct 15, 2020 at 1:41 PM Bobby Bruce via gem5-users < gem5-users@gem5.org> wrote: > Hey Krishnan, > > Linux does take about 45 minutes or so to run using AtomicSimpleCPU. > You're not doing anything wrong in this regard. I'm afraid there's no > information I can give you on making it faster. Anything to make this > significantly faster, would be sacrificing the accuracy of simulation. This > a problem, across the board, for architecture simulators. > > KVMCPU is certainly faster but, given what else you've been saying, you > wish to do real simulations and gather statistics. The KVMCPU is not the > right tool for this. It doesn't simulate anything. It doesn't have timing > information. AtomicSimpleCPU is also not suitable. I'd recommend using the > AtomicTimingCPU, which will give you a decent simulation and stats output. > > Kind regards, > Bobby > -- > Dr. Bobby R. Bruce > Room 2235, > Kemper Hall, UC Davis > Davis, > CA, 95616 > > web: https://www.bobbybruce.net > > > On Thu, Oct 15, 2020 at 1:50 AM krishnan gosakan via gem5-users < > gem5-users@gem5.org> wrote: > >> Hi all. >> I hope everyone is doing good. I recently started working with gem5 >> simulator. I am trying to do some modification to the page table walker >> (pagetable_walker). My problem is that booting linux under full system >> emulation is very slow. It takes nearly 30 to 40 minutes to boot. I am >> using AtomicSimpleCPU. I just want to know if this is the normal case for >> this cpu type. >> >> I also tried with X86KvmCPU and I used the following command, >> $gem5_dir/build/X86/gem5.opt $gem5_config_dir/example/fs.py --kernel >> $linux_dir/vmlinux --disk-image $cur_dir/qemu-image.img --caches --l2cache >> --cpu-type X86KvmCPU --fast-forward 1000000000 >> >> This was faster than atomic simple cpu but the problem here is that all >> stats are cleared up at the end. I shall attach an example stat file with >> this email. In the stat file attached, you may see all the tlb stats >> cleared. I wish to know the reason why stats are cleared in examples/fs.py >> >> I just want to know if there is any way to fasten boot up with an atomic >> simple cpu or is this normal? My work is basically to change the kernel, >> compile it, run under gem5 and check the stats. >> Any kind of suggestions are most appreciated. >> Thank you. >> -- >> Regards, >> Krishnan. >> _______________________________________________ >> gem5-users mailing list -- gem5-users@gem5.org >> To unsubscribe send an email to gem5-users-le...@gem5.org >> %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s > > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
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