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
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