Am 28.05.20 um 21:35 schrieb Marek Olšák:
On Thu, May 28, 2020 at 2:12 PM Christian König
mailto:christian.koe...@amd.com>> wrote:
Am 28.05.20 um 18:06 schrieb Marek Olšák:
On Thu, May 28, 2020 at 10:40 AM Christian König
mailto:christian.koe...@amd.com>> wrote:
Am
On Thu, May 28, 2020 at 2:12 PM Christian König
wrote:
> Am 28.05.20 um 18:06 schrieb Marek Olšák:
>
> On Thu, May 28, 2020 at 10:40 AM Christian König
> wrote:
>
>> Am 28.05.20 um 12:06 schrieb Michel Dänzer:
>> > On 2020-05-28 11:11 a.m., Christian König wrote:
>> >> Well we still need
Am 28.05.20 um 18:06 schrieb Marek Olšák:
On Thu, May 28, 2020 at 10:40 AM Christian König
mailto:christian.koe...@amd.com>> wrote:
Am 28.05.20 um 12:06 schrieb Michel Dänzer:
> On 2020-05-28 11:11 a.m., Christian König wrote:
>> Well we still need implicit sync [...]
> Yeah,
On Thu, May 28, 2020 at 10:40 AM Christian König
wrote:
> Am 28.05.20 um 12:06 schrieb Michel Dänzer:
> > On 2020-05-28 11:11 a.m., Christian König wrote:
> >> Well we still need implicit sync [...]
> > Yeah, this isn't about "we don't want implicit sync", it's about "amdgpu
> > doesn't ensure
Am 28.05.20 um 12:06 schrieb Michel Dänzer:
On 2020-05-28 11:11 a.m., Christian König wrote:
Well we still need implicit sync [...]
Yeah, this isn't about "we don't want implicit sync", it's about "amdgpu
doesn't ensure later jobs fully see the effects of previous implicitly
synced jobs",
On 2020-05-28 11:11 a.m., Christian König wrote:
> Well we still need implicit sync [...]
Yeah, this isn't about "we don't want implicit sync", it's about "amdgpu
doesn't ensure later jobs fully see the effects of previous implicitly
synced jobs", requiring userspace to do pessimistic flushing.
Well we still need implicit sync or otherwise the GPU scheduler would
pick up the jobs in the wrong order.
See without this when we have the following sequence of submission:
Client IB1 using buffer A
Client IB2
X IB1 using buffer A
We could end up with the execution order
X IB1 using buffer
If a user mode driver is changed to rely on the existence of implicit sync,
it results in corruption and flickering as reported here:
https://gitlab.freedesktop.org/mesa/mesa/-/issues/2950
Marek
On Mon, May 25, 2020 at 6:05 PM Marek Olšák wrote:
> Hi Christian,
>
> Bas and Michel wanted to
Hi Christian,
Bas and Michel wanted to discuss this. The main disadvantage of no implicit
(pipeline) sync within the same queue is that we get lower performance and
lower GPU utilization in some cases.
We actually never really needed the kernel to have implicit sync, because
all user mode
