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 > >
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