[PATCH] glamor: Set environment variable RADEON_THREAD=0

[Marek Olšák]

Reviewed-by: Marek Olšák <marek.olsak at amd.com>

Marek

On Wed, Jul 30, 2014 at 9:33 AM, Michel Dänzer <michel at daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> ---
>  src/radeon_glamor.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/src/radeon_glamor.c b/src/radeon_glamor.c
> index 210ddcf..d63a9d4 100644
> --- a/src/radeon_glamor.c
> +++ b/src/radeon_glamor.c
> @@ -132,6 +132,16 @@ radeon_glamor_pre_init(ScrnInfoPtr scrn)
>                         "Incompatible glamor version, required >= 0.3.0.\n");
>                         return FALSE;
>                 } else {
> +                       /* This prevents the Gallium radeon winsys from spawning
> +                        * a separate thread for submitting command streams to
> +                        * the kernel. Imrpoves scores of at least gtkperf and
> +                        * x11perf -putimage/-shmput/-getimage/-shmget, probably
> +                        * because glamor causes too many command stream flushes
> +                        * / too much synchronization with pending command
> +                        * streams for the separate thread to pay off.
> +                        */
> +                       setenv("RADEON_THREAD", "0", 0);
> +
>                         if (glamor_egl_init(scrn, info->dri2.drm_fd)) {
>                                 xf86DrvMsg(scrn->scrnIndex, X_INFO,
>                                            "glamor detected, initialising EGL layer.\n");
> --
> 2.0.1
>
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