https://bugs.freedesktop.org/show_bug.cgi?id=93686
--- Comment #13 from Alex Deucher <[email protected]> --- (In reply to ytrezq from comment #10) > (In reply to Jan Vesely from comment #9) > > If GPU<->CPU synchronization is the only problem then the idea should work > > for iGPUs with coherent access to main memory (HSA complaint?). Then again > > those GPUs probably won't need CPU help any time soon. > > Intel or ᴀᴍᴅ ᴀᴘᴜs can’t (theoretically) do memory sharing between ᴄᴘᴜ ᴀɴᴅ > ɢᴘᴜ. > Intel or ᴀᴍᴅ ᴀᴘᴜs use ᴘᴄɪe even if they are on the same die of the ᴄᴘᴜ. The > ʙɪᴏꜱ or the ᴜᴇꜰɪ firmware allocate a fixed portion of ʀᴀᴍ that appear as > part of “hardware reserved memory” to the ᴏꜱ. > There’s no Unified memory, data has to use the internal ᴘᴄɪe bus. It’s the > same as if the card was an external one with it’s own memory (though it can > directly address ᴄᴘᴜ ram modules). > I can't speak for intel, but on AMD APUs, while the GPU appears as a device on the PCIE bus, it actually has a much faster internal connection to the memory controller. -- You are receiving this mail because: You are the QA Contact for the bug. You are the assignee for the bug.
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