Thanks a lot Andreas for the detailed explanation. I will try your proposed solutions.
Mahshid On Fri, Jul 19, 2013 at 4:37 AM, Andreas Sandberg <andr...@sandberg.pp.se>wrote: > On 07/18/2013 06:06 PM, Mahshid Sedghi wrote: > >> I was wondering if anybody has experienced this prompt when running in >> x86 FS mode: >> >> Clocksource tsc unstable (delta = <some big number> ns) >> >> Apparently this message is shown when the system has multiple available >> clock sources. When running gem5 in the mentioned mode, this message is >> occasionally shown and usually stops the execution from proceeding. Is >> there a solution to fix the problem? >> > > I haven't seen it in any of the normal CPU models, but I have similar > issues when using KVM (hardware virtualization) in gem5. Depending on what > causes this problem and your kernel version you could try one of the > following: > > * Switch to a different clocksource. For example, append > "clocksource=jiffies" to the kernel command line (see boot_osflags in > FSConfig.py if you are using the example scripts). > * Force the kernel to treat the TSC as reliable (append "tsc=reliable") > * Disable the TSC (append "notsc"). The kernel should automatically > choose a different clocksource if you append this option. > > Also, your kernel might be slightly confused if you have changed the clock > frequency of your CPU without removing/updating the "lpj=x" option as this > forces the kernel to use a timing calibrated for a different CPU. > > Yet another possibility is that you have an old version of gem5 that has a > bug that causes the TSC to jump (sometimes backwards) when switching CPUs. > That was fixed by HG changeset e039a48eeb99 (git: 0b4a8b4086). > > //Andreas > > ______________________________**_________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/**mailman/listinfo/gem5-users<http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users> >
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