RPI3 swap experiments ["was killed: out of swap space" with: "v_free_count: 5439, v_inactive_count: 1"]

[Mark Johnston]

On Wed, Aug 08, 2018 at 11:42:10PM -0700, bob prohaska wrote:
> On Wed, Aug 08, 2018 at 03:55:52PM -0600, Warner Losh wrote:
> > 
> > With the da driver there's some hope. Add options IOSCHED to the  kernel
> > config file and reboot. This will give you some detailed statistics, as
> > well as power-of-two bucketized latency histograms. It may even be a vector
> > forward to slow the writes / trims down, though there's some issues when
> > you slow writes down TOO much, it helps *A*LOT* keep the system responsive.
> > We do that at work to make our consumer SSDs not suck for serving content
> > (reading) while we're doing some writes to them... The thumb drives are
> > like the consumer SSDs we buy, only crappier...
> > 
> I tried adding
> options IOSCHED
> to the arm64 GENERIC kernel config at the end of the debugging support options, 
> but buildkernel replied with
> /usr/src/sys/arm64/conf/GENERIC: unknown option "IOSCHED"
> 
> I don't see any typos, should this option go elsewhere?

Looks like the proper name is "CAM_IOSCHED_DYNAMIC".