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From: Steve Simon <steve@quintile.net>
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Date: Sat, 3 Dec 2022 10:02:37 +0000
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Subject: Re: [9front] Question re: RPI video performance
Reply-To: 9front@9front.org
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you are sure it is video performance that is slow and not something else?

try cat /sys/lib/words (rusty memory, probably the wrong path).

you could also try the trusty catclock.

i have never used 9front on the pi but miller=E2=80=99s distro was fine, and=
 the video driver is probably the same=E2=80=A6

-Steve


> On 3 Dec 2022, at 09:50, Nicola Girardi <ng@0x80.stream> wrote:
>=20
> =EF=BB=BFSigrid Solveig Hafl=C3=ADnud=C3=B3ttir <sigrid@ftrv.se> wrote:
>> Could be related to the framebuffer format. Check "aux/zerotrunc </dev/sc=
reen". Try to switch to a different format via config.txt(?), especially if y=
our current mode is 16-bit.
>=20
> Interesting.  I had only configured the mode using hdmi_mode=3D82 in
> config.txt and got r5g6b5 as output to your command.  I now realize I
> can additionally set vgasize in cmdline.txt to 1920x1080x32, then I
> get
>=20
> ; read -c 60 /dev/screen
>   x8r8g8b8           0           0        1920        1080=20
>=20
> Slow as before.  Tried many other modes in the past month, and even
> 640x350 behaves in the same way I'd described earlier.
>=20
> One thing I noticed in the config.txt provided by 9front is that
> gpu_mem is set to 16, while the default is 64.  As a total hunch I
> tried to increase that value to 64 but then the RPI doesn't boot (or
> boots, but screen is blank so I don't know :-)).
>=20
> I can accept the behavior, it's just I'd like to understand more.  I
> tried to understand something from the git history but failed.
>=20