• Eric Anholt's avatar
    drm/i915: Change GEM throttling to be 20ms like the comment says. · b962442e
    Eric Anholt authored
    keithp didn't like the original 20ms plan because a cooperative client could
    be starved by an uncooperative client.  There may even have been problems
    with cooperative clients versus cooperative clients.  So keithp changed
    throttle to just wait for the second to last seqno emitted by that client.
    It worked well, until we started getting more round-trips to the server
    due to DRI2 -- the server throttles in BlockHandler, and so if you did more
    than one round trip after finishing your frame, you'd end up unintentionally
    syncing to the swap.
    Fix this by keeping track of the client's requests, so the client can wait
    when it has an outstanding request over 20ms old.  This should have
    non-starving behavior, good behavior in the presence of restarts, and less
    waiting.  Improves high-settings openarena performance on my GM45 by 50%.
    Signed-off-by: default avatarEric Anholt <eric@anholt.net>
    Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
i915_dma.c 36 KB