[Spice-devel] [PATCH 07/12] qxl-wddm-dod: Set VSync indication period to 200ms
Yuri Benditovich
yuri.benditovich at daynix.com
Sun Mar 12 08:45:04 UTC 2017
Default indication period (13-17ms) from the driver to OS
increases total CPU consumption during presentation operations.
Reducing indication frequency to 200 ms reduces cost of this
feature. Till now we do not see any negative impact of this.
Signed-off-by: Yuri Benditovich <yuri.benditovich at daynix.com>
---
qxldod/QxlDod.cpp | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/qxldod/QxlDod.cpp b/qxldod/QxlDod.cpp
index 7750467..bb9b227 100755
--- a/qxldod/QxlDod.cpp
+++ b/qxldod/QxlDod.cpp
@@ -19,6 +19,7 @@
(QXL_INTERRUPT_CURSOR) | \
(QXL_INTERRUPT_IO_CMD))
+#define VSYNC_PERIOD 200 // ms, use 0 for auto
#define VSYNC_RATE 75
BOOLEAN g_bSupportVSync;
@@ -5043,8 +5044,9 @@ VOID QxlDod::EnableVsync(BOOLEAN bEnable)
else
{
LARGE_INTEGER li;
- LONG period = 1000 / VSYNC_RATE;
- DbgPrint(TRACE_LEVEL_WARNING, ("Enabled VSync(fired %d)\n", m_VsyncFiredCounter));
+ LONG period = VSYNC_PERIOD;
+ if (!period) period = 1000 / VSYNC_RATE;
+ DbgPrint(TRACE_LEVEL_WARNING, ("Enabled VSync %d ms(fired %d)\n", period, m_VsyncFiredCounter));
li.QuadPart = -10000000 / VSYNC_RATE;
KeSetTimerEx(&m_VsyncTimer, li, period, &m_VsyncTimerDpc);
}
--
2.7.0.windows.1
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