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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-01-15 20:11:34 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2009-01-15 20:11:34 +0000
commit73822ec806bc8459047b6e9dea71d675c283a84c (patch)
tree4a7a2c610ba22ddb4a46158f155a798fb74481c8 /qemu-doc.texi
parent5fc1503efc552e0ae0d9fec070d5784f51fce6b9 (diff)
Add -rtc-td-hack option to fix time drift with RTC on Windows (Gleb Natapov)
After my last patch to fix interrupt coalescing was rejected on the basis that it is too intrusive we decided to make the fix much more localized and only fix the problem for RTC time source. Unfortunately it is impossible to fix the problem entirely inside RTC code like Andrzej proposed since Windows reads RTC register C more then once on each time interrupt so it is impossible to count reliably how many interrupt windows actually handled. Proposed solution is localized to I386 target and is disabled by default. To enable it "-rtc-td-hack" flag should be used. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6320 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'qemu-doc.texi')
-rw-r--r--qemu-doc.texi5
1 files changed, 5 insertions, 0 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 5a12dc9e5..f61ae34b4 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -420,6 +420,11 @@ Use it when installing Windows 2000 to avoid a disk full bug. After
Windows 2000 is installed, you no longer need this option (this option
slows down the IDE transfers).
+@item -rtc-td-hack
+Use it if you experience time drift problem in Windows with ACPI HAL.
+This option will try to figure out how many timer interrupts were not
+processed by the Windows guest and will re-inject them.
+
@item -option-rom @var{file}
Load the contents of @var{file} as an option ROM.
This option is useful to load things like EtherBoot.