On 2017年05月10日 05:47, Kasiviswanathan, Harish wrote:
Hi,
Please review the patch set that supports amdgpu VM update via CPU. This
feature provides improved performance for compute (HSA) where mapping /
unmapping is carried out (by Kernel) independent of command submissions (done
directly by user space). This version doesn't support shadow copy of VM page
tables for CPU based update.
I think your improved performance is from less waiting for cs,
generally, SDMA engine updating page table is faster than CPU, otherwise
we don't need sdma for updating PT.
So whether your this improvement proves we have some redundant sync when
mapping / unmapping, if yes, we should fix that, then not sure if CPU
method is need or not.
Regards,
David Zhou
Best Regards,
Harish
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