On Fri, Nov 28, 2014 at 10:29:55AM +0100, Daniel Vetter wrote: > So apparently jiffies<->nsec<->ktime isn't accurate or something. At > elast if we timeout there's occasionally still a few hundred us left > (in a 2 second timeout). > > Stuff I've tried and thrown out again: > - Sampling the before timestamp before jiffies. Doesn't improve test > path rate at all. > - Using jiffies. Way to inaccurate, which means way too much drift > with signals plus automatic ioctl restarting in userspace. In > hindsight we should have used an absolute timeout, but hey we need > something for v3 of the i915 gem wait interfaces ;-) I am still trying to get my head around an ioctl that only works in jiffie intervals where the jiffie is too inaccurate. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
