SOLVED Re: Sloow blender on FreeBSD (vs Ubuntu)

[Mathias Picker]

Mathias Picker <Mathias.Picker at virtual-earth.de> writes:

> Mathias Picker <Mathias.Picker at virtual-earth.de> writes:
>
>> Well, I forgot to include some info about the system:
>>
>> dmesg https://pastebin.com/RGA3VLiB
>> xorg.log https://pastebin.com/8C49UGKk
>>
>> anything else, just ask.
>>
>> Mathias Picker <Mathias.Picker at virtual-earth.de> writes:
>>
>>> Hi all,
>>>
>>> the last days I tried to get blender into working state on a 
>>> 2nd gen Thinkpad
>>> X1 Yoga.
>>>
>>> tl;dr
>>>
>>> blender is stuttering and jerky on my X1 running an I7-8550U / 
>>> UHD620
>>> (4-core,
>>> 2/4Ghz) and FreeBSD, while it works like a charm on my Surface 
>>> Go Pentium
>>> Gold
>>> 4415Y/HD615 (2-core, 1.6Ghz) with Ubuntu.
>>> This is both on 12-STABLE and -CURRENT. It’s a bit better on 
>>> -CURRENT, but
>>> still horrible.
>>>
>>> Is there any way to speed blender up on FreeBSD?
>>>
>>>
>>> Long version:
>>> I wanted to try out blenders Grease Pencil, up until now I 
>>> only used blender
>>> for video editing.
>>>
>>> GP or rotating 3D-Scenes in blender 2.90 on 12-STABLE was 
>>> abysmally slow and
>>> crashed repeatedly after a few strokes with grease pencil or a 
>>> few minutes
>>> work in the 3D-view with:
>>> Jan  4 23:04:17 Danton kernel: drmn0: GPU HANG: ecode 
>>> 9:1:0x87f99eb9, in
>>> blender [100824], hang on rcs0
>>> Jan  4 23:04:17 Danton kernel: drmn0: Resetting rcs0 for hang 
>>> on rcs0
>>>
>>> The GPU reset did not work, machine hangs, reboot via ssh.
>>>
>>> Recompiled blender, tried older version, all with the same 
>>> result, 
>>> although 2.8x seemed a bit faster, but still slow & crashes.
>>>
>>> Searched the web, found similar problems by others on Linux, 
>>> suggested KMS
>>> update.
>>>
>>> So I switched to -CURRENT with drm-current-kmod (5.4 instead 
>>> of 4.5)
>>>
>>> Same GPU hang, but here the reset works. Performance 
>>> *slightly* better, but
>>> every hang takes about 2 sec, no way to work with this.
>>>
>>> Updating X1 bios - now the error did not happen for quite some 
>>> time. 
>>>
>>> But still, quite slow. Stuttering when rotating the default 
>>> cube in simple
>>> solid  or  wireframe mode. On a I7-8550U running full speed 
>>> (hwpstate_intel
>>> with epp=0), cpu freq between 2500 and 3900).
>>>
>>> Installed mesa-devel：the GPU hang is back.
>>>
>>> Recompiled blender to 2.91.0_2, mesa-devel, drm everything. No 
>>> more GPU hang
>>> for now, but still stuttering motions, Grease Pencil strokes 
>>> hang back 1-2
>>> seconds from my stylus.
>>>
>>> Then I tried my 1st gen Surface Go 8Gb running Ubuntu: Blender 
>>> is 
>>> blazing fast for these simple tasks. Fluid rotation, allmost 
>>> real 
>>> time grease pencil：WTF?
>>>
>>> This is an i7-8550U quad core running 2/4Ghz with an UHD620 
>>> GPU against a
>>> Pentium Gold, and the Pentium wins hands down?
>>>
>>> I would really *love* to get blender up even only to Pentium 
>>> speed. Blender
>>> with simple models in solid mode should *fly* on my X1, same 
>>> with a few
>>> Grease Pencil strokes…
>>>
>>>
>>> Any ideas, help, suggestion?
>>>
>>> Thanks, Mathias
>
> Just tried a live CD of Ubuntu on the same machine, with the 
> demo Race Spaceship 
> https://download.blender.org/demo/eevee/race_spaceship/race_spaceship.blend
>
> This is a compley scene and can be rotated with ubuntu in real 
> time in material
> mode, and is only very slightly lagging in rendered mode.
>
> On FreeBSD that spaceship rotates about as slow and stuttery as 
> the default
> cube.
> So it does not seem to be dependent on the complexity of the 
> scene.
>
> Any ideas where to look?
>
> Any ideas whom to ask?
>
> Thanks, Mathias

Using either

vblank_mode=0 blender

or

LIBGL_DRI3_DISABLE=1 blender

gives me the speed I need. Now it’s faster than the surface go ;)


/ Mathias

-- 
Mathias Picker                        
Geschäftsführer
Mathias.Picker at virtual-earth.de

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