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authorSebastian Tanase <sebastian.tanase@openwide.fr>2014-07-25 11:56:29 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2014-08-06 17:53:07 +0200
commita8bfac37085c3372366d722f131a7e18d664ee4d (patch)
tree51cd30abe502c20f1334220a6766a3319219f0a6 /qemu-options.hx
parent1ad9580bd730f195a59136d11fdc431f90f266aa (diff)
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icount: Add align option to icount
The align option is used for activating the align algorithm in order to synchronise the host clock and the guest clock. Signed-off-by: Sebastian Tanase <sebastian.tanase@openwide.fr> Tested-by: Camille Bégué <camille.begue@openwide.fr> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-options.hx')
-rw-r--r--qemu-options.hx15
1 files changed, 13 insertions, 2 deletions
diff --git a/qemu-options.hx b/qemu-options.hx
index 5a1b001..96516c1 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3011,9 +3011,9 @@ re-inject them.
ETEXI
DEF("icount", HAS_ARG, QEMU_OPTION_icount, \
- "-icount [shift=N|auto]\n" \
+ "-icount [shift=N|auto][,align=on|off]\n" \
" enable virtual instruction counter with 2^N clock ticks per\n" \
- " instruction\n", QEMU_ARCH_ALL)
+ " instruction and enable aligning the host and virtual clocks\n", QEMU_ARCH_ALL)
STEXI
@item -icount [shift=@var{N}|auto]
@findex -icount
@@ -3026,6 +3026,17 @@ 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 hierarchies. The number of instructions
executed often has little or no correlation with actual performance.
+
+@option{align=on} will activate the delay algorithm which will try to
+to synchronise the host clock and the virtual clock. The goal is to
+have a guest running at the real frequency imposed by the shift option.
+Whenever the guest clock is behind the host clock and if
+@option{align=on} is specified then we print a messsage to the user
+to inform about the delay.
+Currently this option does not work when @option{shift} is @code{auto}.
+Note: The sync algorithm will work for those shift values for which
+the guest clock runs ahead of the host clock. Typically this happens
+when the shift value is high (how high depends on the host machine).
ETEXI
DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \