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From: Steve Simon <steve@quintile.net>
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Subject: Re: [9front] Question re: RPI video performance
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which pi do you have, the ancient ones can be slow but 3b and 4 have been fi=
ne for me.

it is true that plan9 doesnt make very much use of the gpu, but it  use it. c=
omparing to x11 or wayland, plan9 is probably never going to be as fast.

> On 3 Dec 2022, at 11:14, Nicola Girardi <ng@0x80.stream> wrote:
>=20
> =EF=BB=BFSteve Simon <steve@quintile.net> wrote:
>> you are sure it is video performance that is slow and not something else?=

>=20
> In fact, I'm not sure at all.
>=20
> OTOH, I'm aware that screen updates can become very slow when the
> system is under load, but that's understandable.  If I load a page in
> mothra, say, the mouse becomes much less responsive until the page is
> fully loaded.  But the slow screen updates also happen when the system
> is idle (I mostly only do text editing).
>=20
>> try cat /sys/lib/words (rusty memory, probably the wrong path).
>>=20
>> you could also try the trusty catclock.
>=20
> I'm not sure I understand your test; you're proposing to run programs
> that don't do much other than updating the screen; if they run fast,
> the video performance is good enough and the slowness I'm observing is
> due to something else.  Is that right?
>=20
> Catclock runs smoothly, but admittedly only updates a small part of
> the screen.  Cat'ing a large file (in a window with scroll enabled) is
> indeed slow.  Unhiding a rio window is slow to redraw, even if it's
> just a window running rc where I previosly cat'ed a file.
>=20
>> i have never used 9front on the pi but miller=E2=80=99s distro was fine, a=
nd the video driver is probably the same=E2=80=A6
>=20
> I'd try that for comparison but I'm not sure I have a spare sd card,
> I'll check.
>=20