I'm experiencing this problem with newer, untested versions of qemu as well. I've only seen it happen with SMT configurations, however -- have either of you seen it without SMT?
Tyler > We sometimes had this happen too, but I think no one has found a reliable > way to figure out where the problem happens. > > When you say 'never', how long have you waited for it? In my experience > sometimes when this happens, it can stay in kernel mode a long long time > but then eventually come back to user space. > > > On Wed, Dec 4, 2013 at 10:27 PM, Hongsun An <[email protected]> wrote: > >> Hello, >> >> I'm using marss86+dramsim2 >> I made a checkpoint of sphinx3 after fastfowarding 10 billions >> instructions >> and simulated the checkpoint. >> >> here is the middle of the log >> >> Completed 1060261000 cycles, 415478808 commits: 940320 Hz, >> 332565 insns/sec: rip 000000000041e5cf >> Completed 1060450000 cycles, 415546041 commits: 940386 Hz, >> 334523 insns/sec: rip 000000000041e5cf >> Completed 1060633000 cycles, 415610543 commits: 912773 Hz, >> 321725 insns/sec: rip 0000000000402a25 >> Completed 1060811000 cycles, 415672043 commits: 889292 Hz, >> 307255 insns/sec: rip 0000000000415c42 >> Completed 1061031000 cycles, 415712907 commits: 1099278 Hz, >> 204185 insns/sec: rip ffffffff8105f411 >> Completed 1061175000 cycles, 415825905 commits: 715988 Hz, >> 561841 insns/sec: rip ffffffff810c043a >> Completed 1061237000 cycles, 416011905 commits: 307139 Hz, >> 921417 insns/sec: rip ffffffff810c043a >> Completed 1061299000 cycles, 416197905 commits: 306858 Hz, >> 920576 insns/sec: rip ffffffff810c043a >> Completed 1061361000 cycles, 416383905 commits: 306683 Hz, >> 920050 insns/sec: rip ffffffff810c043a >> ....... >> ....... >> user.base_machine.ooo_0_0.thread0.commit.ipc = 0.391764 >> kernel.base_machine.ooo_0_0.thread0.commit.ipc = 2.99783 >> total.base_machine.ooo_0_0.thread0.commit.ipc = 2.29421 >> >> At some point, rip is changed to ffffffff810c043a and never turns back >> to >> 0x000000000xxxxx. >> Every benchmark has simliar result. >> >> I simulated soplex, libquantum with test input and they worked well. >> What I was missing.. >> >> >> >> _______________________________________________ >> 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 > _______________________________________________ http://www.marss86.org Marss86-Devel mailing list [email protected] https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel
