Current NVidia GPU Launch Latency: 10 microseconds

By: Freddie (freddie.delete@this.witherden.org), June 1, 2022 9:44 am
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on May 31, 2022 1:07 pm wrote:
> One can imagine a more integrated PCIe CLX protocol doing things more in H/W and keeping the OS out of
> the critical path, but the current time to do a minimal something with a GPU is about 10 microseconds.

What makes you think the OS is in the critical path at the moment? The GPU compute world has been pretty good at moving to user-space submission, so there should not be any kernel involvement what so ever. Incidentally, this is why an NVIDIA GPU connected over PCIe has 1/5 the launch latency compared with an integrated Intel GPU which shares an L3 cache with the CPU; Intel last time I checked still do ioctl based submission.

Regards, Freddie.


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            Current NVidia GPU Launch Latency: 10 microsecondsMark Roulo2022/05/31 01:07 PM
              Current NVidia GPU Launch Latency: 10 microsecondsFreddie2022/06/01 09:44 AM
      Crazy CXL Names---2022/05/31 07:56 PM
        Crazy CXL Namesaaron spink2022/05/31 08:32 PM
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