Hi!
> Reported-by: Jens Axboe
> Link: https://lkml.org/lkml/2015/11/12/621
> Cc: Jens Axboe
> Cc; "Rogozhkin, Dmitry V"
> Cc: Daniel Vetter
> Cc: Tvrtko Ursulin
> Cc: Eero Tamminen
> Cc: "Rantala, Valtteri"
> Cc: sta...@kernel.vger.org
> ---
> drivers/gpu/drm/i915/i915_gem.c | 28 +
On 11/15/2015 06:32 AM, Chris Wilson wrote:
When waiting for high frequency requests, the finite amount of time
required to set up the irq and wait upon it limits the response rate. By
busywaiting on the request completion for a short while we can service
the high frequency waits as quick as poss
On Mon, Nov 16, 2015 at 12:55:37PM +, Chris Wilson wrote:
> On Mon, Nov 16, 2015 at 12:08:08PM +, Tvrtko Ursulin wrote:
> >
> > On 16/11/15 11:12, Chris Wilson wrote:
> > >On Mon, Nov 16, 2015 at 10:24:45AM +, Tvrtko Ursulin wrote:
> > >>On 15/11/15 13:32, Chris Wilson wrote:
> > >>>+s
On 16/11/15 12:55, Chris Wilson wrote:
On Mon, Nov 16, 2015 at 12:08:08PM +, Tvrtko Ursulin wrote:
On 16/11/15 11:12, Chris Wilson wrote:
On Mon, Nov 16, 2015 at 10:24:45AM +, Tvrtko Ursulin wrote:
On 15/11/15 13:32, Chris Wilson wrote:
+static u64 local_clock_us(unsigned *cpu)
+{
+
On Mon, Nov 16, 2015 at 12:08:08PM +, Tvrtko Ursulin wrote:
>
> On 16/11/15 11:12, Chris Wilson wrote:
> >On Mon, Nov 16, 2015 at 10:24:45AM +, Tvrtko Ursulin wrote:
> >>On 15/11/15 13:32, Chris Wilson wrote:
> >>>+static u64 local_clock_us(unsigned *cpu)
> >>>+{
> >>>+ u64 t;
> >>>+
> >>
On 16/11/15 11:12, Chris Wilson wrote:
On Mon, Nov 16, 2015 at 10:24:45AM +, Tvrtko Ursulin wrote:
Hi,
On 15/11/15 13:32, Chris Wilson wrote:
When waiting for high frequency requests, the finite amount of time
required to set up the irq and wait upon it limits the response rate. By
busyw
On Mon, Nov 16, 2015 at 10:24:45AM +, Tvrtko Ursulin wrote:
>
> Hi,
>
> On 15/11/15 13:32, Chris Wilson wrote:
> >When waiting for high frequency requests, the finite amount of time
> >required to set up the irq and wait upon it limits the response rate. By
> >busywaiting on the request compl
Hi,
On 15/11/15 13:32, Chris Wilson wrote:
When waiting for high frequency requests, the finite amount of time
required to set up the irq and wait upon it limits the response rate. By
busywaiting on the request completion for a short while we can service
the high frequency waits as quick as pos
On Sun, Nov 15, 2015 at 01:32:44PM +, Chris Wilson wrote:
> +static bool busywait_stop(u64 timeout, unsigned cpu)
> +{
> + unsigned this_cpu;
> +
> + if (time_after64(local_clock_us(&this_cpu), timeout))
> + return true;
Just a note to say that we can use the unsigned long
When waiting for high frequency requests, the finite amount of time
required to set up the irq and wait upon it limits the response rate. By
busywaiting on the request completion for a short while we can service
the high frequency waits as quick as possible. However, if it is a slow
request, we wan
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