On Thu, Oct 26, 2017 at 08:31:27AM +0100, Chris Wilson wrote: > For measuring the cost of preemption, inject a low priority spinner > between the two measurements; the difference between the preemption and > the normal dispatch includes both the cost of the spinner dispatch and > of preempting it. Close enough for us to estimate the cost of > preemption, though we don't measure the cost of preemption on the local > ring! And as expected, we're seeing more delay with GuC, probably from worker scheduling delay (~2ms on my SKL if I'm reading the results correctly). Reviewed-by: Michał Winiarski <michal.winiarski@xxxxxxxxx> -Michał > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > CC: Michał Winiarski <michal.winiarski@xxxxxxxxx> > --- > tests/gem_exec_latency.c | 88 ++++++++++++++++++++++++++++++++---------------- > 1 file changed, 59 insertions(+), 29 deletions(-) _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
