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Date: Wed, 8 Aug 2018 23:42:10 -0700
From: bob prohaska <fbsd@www.zefox.net>
To: Warner Losh <imp@bsdimp.com>
Cc: Mark Johnston <markj@freebsd.org>,
 "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>,
 bob prohaska <fbsd@www.zefox.net>
Subject: Re: RPI3 swap experiments ["was killed: out of swap space" with:
 "v_free_count: 5439, v_inactive_count: 1"]
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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?

Thanks very much!

bob prohaska