On Tue, Jun 16, 2020 at 02:02:44PM +0200, Matthias Brugger wrote: > +nicolas +michal > > On 16/06/2020 14:00, Freek de Kruijf wrote: > > I am doing some testing with the newest Tumbleweed images for the Raspberry > > Pi > > 4B. The micro-SD card I was using for the KDE version showed a rather slow > > system. Long waiting between commands. > > > > After trying to change the default language with "yast language", which > > pulls > > in quite a lot of new packages, the system was very slow. Finally dmesg > > showed > > error messages complaining: > > > > mmc1 timeout waiting for hardware interrupt > > > > Searching for a solution I found the following patch: > > > > https://patchwork.kernel.org/patch/10219153/ > > > > The main cause seems to be the behaviour of certain SD cards of which I > > apparently have one. I do have a similar card, same brand, same kind and > > same > > size, which does not show this behaviour. > > > > So my question is: Has this patch been implemented in the newest version of > > Tumbleweed for the RPi4? Most likely. > > If not, would it solve this problem? > > No.
In the case that matters it seems most of the system is locked up. I suspect something essential like the DMA controller locks up rather than the MMC controller itself. I can see now why Chinese chips employ multiple DMA cotrollers with key components like storage having a private DMA each. Given the low general interest and low occurence of these broken cards I gave up on debugging this. I may be able to find the one card that exhibits the problem after covid-19 situation stabilizes some more but I did not seriously try to debug a low-level problem like this yet. Thanks Michal -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
