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SubjectRe: Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )
>> Well that is very interesting, you are the first one who reports that SME +
>> GFX works in some way. So far we only got negative reports for that.
>>
>>> There is a 4.16.13 boot dmesg which has no such issue:
>>>
>>>
>>> http://ftp.frugalware.org/pub/other/people/crazy/radeon/dmesg-radeon-SME-ON-kernel-4.16.txt
>>>
>>> With the setup as is booting 4.16.x works , while 4.17 trows the errors.
>>
>>
>> Please do the bisect if the patch I've mentioned above doesn't help.
>
> Ok done.. bisect points to:
>
> b468620f2a1dfdcfddfd6fa54367b8bcc1b51248 is the first bad commit
> commit b468620f2a1dfdcfddfd6fa54367b8bcc1b51248
> Author: Christoph Hellwig <hch@lst.de>
> Date: Mon Mar 19 11:38:19 2018 +0100
>
> iommu/amd_iommu: Use CONFIG_DMA_DIRECT_OPS=y and dma_direct_{alloc,free}()
>
> This cleans up the code a lot by removing duplicate logic.
>
> Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
> Tested-by: Joerg Roedel <jroedel@suse.de>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
> Acked-by: Joerg Roedel <jroedel@suse.de>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Jon Mason <jdmason@kudzu.us>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Muli Ben-Yehuda <mulix@mulix.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: iommu@lists.linux-foundation.org
> Link: http://lkml.kernel.org/r/20180319103826.12853-8-hch@lst.de
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
>
>
> I'll try to revert this once I'm home.

I can confirm reverting b468620f2a1dfdcfddfd6fa54367b8bcc1b51248
fixes that issue for me.

The GPU is working fine with SME enabled.

Now with working GPU :) I can also confirm performance is back to normal
without doing any other workarounds.

The only app still acting up a bit is Firefox , just minor frame drops,
but nothing to bad. ( probably an Firefox bug too )

crhomium/chrome is fine .. even with 10 tabs open , each one playing
an video on youtube no glitches at all.

Desktop is also fine now, could not find anything wrong.


BR

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