diff options
Diffstat (limited to 'tools/examples')
| -rw-r--r-- | tools/examples/xmexample.hvm | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/tools/examples/xmexample.hvm b/tools/examples/xmexample.hvm index e5ae97f966..09edda6aac 100644 --- a/tools/examples/xmexample.hvm +++ b/tools/examples/xmexample.hvm @@ -178,11 +178,16 @@ stdvga=0 serial='pty' #---------------------------------------------------------------------------- -# tsc_native : TSC mode (0=emulate TSC, 1=native TSC) +# tsc_mode : TSC mode (0=default, 1=native TSC, 2=never emulate, 3=pvrdtscp) # emulate TSC provides synced TSC for all vcpus, but lose perfomrance. # native TSC leverages hardware's TSC(no perf loss), but vcpu's TSC may lose -# sync due to hardware's unreliable/unsynced TSC between CPUs. -tsc_native=1 +# sync due to hardware's unreliable/unsynced TSC between CPUs. +# default intelligently uses native TSC on machines where it is safe, but +# switches to emulated if necessary after save/restore/migration +# pvrdtscp is for intelligent apps that use special Xen-only paravirtualized +# cpuid instructions to obtain offset/scaling/migration info and maximize +# performance within pools of machines that support the rdtscp instruction +tsc_mode=0 #----------------------------------------------------------------------------- # Qemu Monitor, default is disable |