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Date: Sun, 18 Mar 2018 14:08:27 -0700
From: bob prohaska <fbsd@www.zefox.net>
To: Jeff Roberson <jroberson@jroberson.net>
Cc: "O. Hartmann" <ohartmann@walstatt.org>,
 Roman Bogorodskiy <novel@FreeBSD.org>,
 "Danilo G. Baio" <dbaio@FreeBSD.org>,
 "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>,
 Trond Endrest?l <Trond.Endrestol@fagskolen.gjovik.no>,
 FreeBSD current <freebsd-current@freebsd.org>,
 Kurt Jaeger <lists@opsec.eu>, bob prohaska <fbsd@www.zefox.net>
Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT
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On Sun, Mar 11, 2018 at 10:43:58AM -1000, Jeff Roberson wrote:

> Also, if you could try going back to r328953 or r326346 and let me know if 
> the problem exists in either.  That would be very helpful.  If anyone is 

Not sure this is relevant, but r326343 is able to run a j4 buildworld
to completion on an RPi3 with 3 gigs of microSD-based swap. There are
periods of seeming distress at times (lots of swread, pfault state
in top along with high %idle) in top, but the compilation completes.

In contrast, r328953 could not complete buildworld using -j4. Buildworld
would stop, usually reporting c++ killed, apparently for want of swap,
even though swap usage never exceeded about 30% accoring to top.

The machine employs UFS filesystems, the kernel config can be seen at

http://www.zefox.net/~fbsd/rpi3/kernel_config/ZEFOX

Thanks for reading, I hope it's useful.

bob prohaska