linux-kernel - Re: Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )

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Message-ID: <CAEJqkggkZynDvV8XxkFfy89x-DX5xDTyubUJ3oXBO6eUjBWBKw@mail.gmail.com>
Date:   Fri, 8 Jun 2018 15:32:06 +0200
From:   Gabriel C <nix.or.die@...il.com>
To:     Christian König <christian.koenig@....com>
Cc:     Christoph Hellwig <hch@....de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Jean-Marc Valin <jmvalin@...illa.com>,
        Dave Airlie <airlied@...ux.ie>,
        Felix Kuehling <Felix.Kuehling@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org, Joerg Roedel <jroedel@...e.de>,
        alexander.deucher@....com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michel Dänzer <michel@...nzer.net>
Subject: Re: Kernel and ADM hardware roulette ( was AMD graphics performance
 regression in 4.15 and later )

2018-06-08 8:52 GMT+02:00 Christian König <christian.koenig@....com>:
> Am 08.06.2018 um 08:02 schrieb Christoph Hellwig:
>>
>> On Thu, Jun 07, 2018 at 02:32:46PM +0200, Gabriel C wrote:
>>>
>>> Ok done.. bisect points to:
>>
>> What is the failure mode you are seeing?  Can't find anything in the
>> mail unfortunately.
>
>
> As far as I analyzed it we now get an -ENOMEM from dma_alloc_attrs() in
> drivers/gpu/drm/ttm/ttm_page_alloc_dma.c when IOMMU is enabled.
>
> Still need to figure out which parameters we want to use for the allocation,
> but I think it is only 4k or 8k.

When you guys need me to test something , or run debug patches
or patches of any sort just let me know..

>
> Regards,
> Christian.

BR