Messages in this thread | | | From | Gabriel C <> | Date | Thu, 7 Jun 2018 18:24:33 +0200 | Subject | Re: Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later ) |
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>> 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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