That's true, and I don't care about it. I'd like to get a method to stop/start time inside qemu in order to simulate execution of large pieces of hw out of qemu (look at qemu-systemc project). If qemu is freeze meanwhile a systemc simulation is in progress (simulating a HW device of system), time should be freeze also. In this way, execution time of a program inside qemu should appear shorter when using accelerator HW than only SW application. I know these times are not reals, but it should be enough to estimate correctness and execution time on real platforms.
Does a way to stop/start time inside qemu? Thanks, Màrius En/na Paul Brook ha escrit: > On Friday 29 December 2006 17:53, Màrius Montón wrote: > >> Hi, >> >> As I understand, OSes running inside qemu "have" notion of time: (its >> date and time works, time(1) command works, etc.). >> My question is about how qemu manages time. I need to stop and start >> again this "virtual-time". >> > > qemu doesn't maintain virtual time, it just uses the real host time. > > >> I just tried with cpu_disable_ticks() and cpu_enable_ticks(). It seems >> to work partially: at least now system date and time are out of sync.. >> > > I suspect you'll find that for anything other than very coarse user (ie. user > stop/continue) these are effectively useless. > > Any benchmark/performance measurements you make inside qemu are meaningless. > qemu performance bears no relation whatsoever to the performance > characteristics of real hardware. > > > Paul > > > _______________________________________________ > Qemu-devel mailing list > Qemu-devel@nongnu.org > http://lists.nongnu.org/mailman/listinfo/qemu-devel > > -- Màrius Montón i Macián [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> http://cephis.uab.es <http://www.mariusmonton.name> Hardware Engineer CEPHIS Centre de Prototips i Solucions Hardware-Software Dep. Microelectrònica i Sistemes Electrònics ETSE - Universitat Autònoma de Barcelona (UAB) Phone: +34 935 813 534 Fax: +34 935 813 033 QC-2090D. ETSE. Campus UAB. 080193 Bellaterra
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