On 3/18/2020 9:44 AM, Jim Hall wrote:
Actually, I think it's a problem on the Raspberry Pi 4. I've heard
from a few folks since the RPi4 came out that my how-to about running
FreeDOS on the Raspberry Pi (via QEMU)
<https://opensource.com/article/18/3/can-you-run-dos-raspberry-pi> results
in a very slow FreeDOS. But I've only heard from people about the
Raspberry Pi 4. The RPi3 seems to work okay. I have a Raspberry Pi 3,
and it works fine. I've run my RPi3 with both Raspbian and Fedora ARM
with the same results, so I don't think it's a distro issue, either.
The Raspberry Pi (as lease version 3) is fast enough to emulate a '486
or Pentium CPU well enough to run DOOM and AsEasyAs and other DOS
games and applications without lag.
Well, what kind of Raspberry Pi3 do you have? A "plain" 3B or a 3B+?
The 3B+ has a 1.4GHz Cortex-A53 CPU, while the 4B+ has a 1.5GHz
Cortex-A72 CPU. And given that a 4B+ is on average 4x as fast as a 3B+,
with only 0.1GHz difference in clock speed, there could be that QEMU
just isn't using the 4B+ CPU properly.
I haven't run QEMU on my RPi4B+ (beside that it is sitting off-site at a
client right now) but everything I tested with it, in the way I intended
to use it, it was a significantly, noticeable difference. So from the
plain capabilities of the 4B+, there should be no reason why it would be
so slow in QEMU.
Well, the GPU part of the SoC chip could of course be culprit here, now
that the 4B+ by default supports a two monitors. Can someone run a
"speedtest" between a 3B+ and a 4B+ with an application that doesn't use
any screen output to possibly verify this?
Ralf
PS: FWIW, I have not been able to run WCG via BOINC on the RPi4B+,
getting the message that the project doesn't have any work units for
computers of the type "arm-unknown-linux-gnueabihf", while it was
running just fine on my RPi3B+.
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