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qxl-wddm-dod: Set VSync indication period to 200ms

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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@daynix.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
This commit is contained in:
yuri.benditovich@daynix.com 2017-04-01 19:40:34 +03:00 committed by Frediano Ziglio
parent 074cc3ef58
commit 9460db8760
1 changed files with 4 additions and 2 deletions
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6
qxldod/QxlDod.cpp
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@ -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;
@ -5006,8 +5007,9 @@ 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);
}