[Spice-devel] [PATCH 07/12] qxl-wddm-dod: Set VSync indication period to 200ms

[Frediano Ziglio]

> 
> 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);
>          }

Acked-by: Frediano Ziglio <fziglio at redhat.com>

Frediano