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Diffstat (limited to 'qemu-doc.texi')
| -rw-r--r-- | qemu-doc.texi | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi index e8641178db..057b9f6551 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -965,6 +965,17 @@ On M68K this implements the "ColdFire GDB" interface used by libgloss. Note that this allows guest direct access to the host filesystem, so should only be used with trusted guest OS. + +@item -icount [N|auto] +Enable virtual instruction counter. The virtual cpu will execute one +instruction every 2^N ns of virtual time. If @code{auto} is specified +then the virtual cpu speed will be automatically adjusted to keep virtual +time within a few seconds of real time. + +Note that while this option can give deterministic behavior, it does not +provide cycle accurate emulation. Modern CPUs contain superscalar out of +order cores with complex cache heirachies. The number of instructions +executed often has little or no correlation with actual performance. @end table @c man end |