On Oct 24 12:15:49, h...@stare.cz wrote:
> On Oct 24 10:01:42, h...@stare.cz wrote:
> > > Does the swap partition sd0b actually exist,
> > > or are you by any chance running these machines swapless?
> >
> > Indeed, I am running without swap.
> >
> > > I've seen this seemingly random unstable behavior
> > > on our RockPI 4a SBCs when no swap is configured.
> >
> > I can confirm that after adding a 1GB swap partition,
> > these random killings have completely disappeared.
> > Thank you! (I will also try on the RPI4.)
>
> Yep: adding 256MB of sd0b to the RPI4 makes these disappear
> - just did a kernel build. Thanks again.
THis is just o say that 16MB of swap
is enough for the machine to work just fine.
Jan
> > > Just to be clear - the lack of a swap partition
> > > causes this behaviour even when plenty of physical RAM is available.
> >
> > Yes, that seems to be my case too.
> > I don't understand it though:
> >
> > $ swapctl -l
> >
> > Device 512-blocks Used Avail Capacity Priority
> > /dev/sd0b 2104516 0 2104516 0% 0
> >
> > $ swapctl -s
> > total: 2104516 512-blocks allocated, 0 used, 2104516 available
> >
> > The swap never gets used. For example, I just did full
> > kernel build, and swapctl -s still says zero.
> >
> > If there is enough RAM to not have to swap,
> > why would a missing swap get processes killed
> > (if that was actualy the root cause of course)?
> >
> > > In our case, creating a swap parition of a mere 32 MB
> > > mitigated the issue, even though it wasn't touched doing
> > > a kernel compile with 4 Gb of physical RAM.
> >
> > I will try with a very small swap partition just to confirm;
> > in fact, the installer has offered to create a ~32MB swap
> > on a 2GB card before and I foolishly did not use it,
> > thinking I will not need swap anyway.
> >
> > Is this known? Or is there another reason the installer
> > wants to create e.g. a 32 MB swap on a machine with 1GB RAM
> > and a few GB of disk?
> >
> > There is something else going on on the swap partition,
> > even of not used for lack of physical ram: for example,
> > now that I run with the swap partition, I can remove it
> > with swapctl -d, but cannot remove it from the disklabel
> > because disklabel: DIOCWDINFO: Device busy.
>
>
