Swap_pager messages when no swap is in use

[Warner Losh]

On Sun, Oct 20, 2019, 6:43 PM bob prohaska <fbsd at www.zefox.net> wrote:

> On Sun, Oct 20, 2019 at 06:14:37PM -0600, Warner Losh wrote:
> > On Sun, Oct 20, 2019, 6:04 PM bob prohaska <fbsd at www.zefox.net> wrote:
> >
> > > While running svnlite to update sources on a Pi3 running -currrent
> > > I was surprised to notice a flurry of
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 133095, size:
> 4096
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 136056, size:
> 4096
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 140560, size:
> 4096
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 134290, size:
> 8192
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 124869, size:
> 16384
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 125113, size:
> 4096
> > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 142799, size:
> 4096
> > > messages when no swap seemed to be in use. Gstat reported much
> congestion
> > > of the microSD card, holding / and half the swap, but there was no
> obvious
> > > activity reading or writing swap, just the root partition.
> > >
> > > Should this be considered normal? It strikes me as very odd.
> > >
> >
> > It took more than 30s for the IO to complete. Sadly, this is normal for
> > cheap SD cards.
> >
>
> Ok, but why is the swapping system complaining when there's no swapping
> going on?
>

The swap pager is complaining. It is used for things other than pure
swapping to a swap partition...

Warner


Thanks for reading,
>
> bob prohaska
>
>