Date: Fri, 15 Jun 2018 13:18:56 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: Warner Losh <imp@bsdimp.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net> Subject: Re: GPT vs MBR for swap devices Message-ID: <91986169-F9AE-45AA-BA34-332BB89C5439@yahoo.com> In-Reply-To: <20180615164202.GB39777@www.zefox.net> References: <20180614175622.GC35161@www.zefox.net> <201806142110.w5ELAL0N046840@pdx.rh.CN85.dnsmgr.net> <20180615035225.GA37370@www.zefox.net> <CANCZdfoNasSpvEN-y3bzsDfWT=_atfp62AKvdpwK8bUQKi=bgA@mail.gmail.com> <20180615051527.GB37370@www.zefox.net> <834EA7A6-B567-436F-96B2-0C75FACA3FF9@yahoo.com> <20180615154334.GA39777@www.zefox.net> <CANCZdfoCA=E=Sh2X6H=Fi-TBkhiTdyzXAkjXr4usa8ie6%2Buo4g@mail.gmail.com> <20180615164202.GB39777@www.zefox.net>
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On 2018-Jun-15, at 9:42 AM, bob prohaska <fbsd at www.zefox.net> wrote: > On Fri, Jun 15, 2018 at 09:57:17AM -0600, Warner Losh wrote: > >> gstat -Bd -I 10 -f <regexp for your swap partition> > gstat-swap-data.dat >> >> would be how I'd recommend collecting it. This file may get kinda big >> depending how long it takes to trigger the weird state. I'm hoping that if >> you put this on a known good device, we'll power through the issues. We >> might not get perfect correlation with this, but the data should show all >> kinds of crazy before the system drives off the cliff if I'm right, so we >> don't need perfect data. >> > > Apologies, we spoke of gstat earlier. I lost the distinction between > gstat and vmstat. In the case at hand the possible swap devices are > > /dev/da0b (this is the one causing trouble) > /dev/mmcsd0s3b > /dev/mmcsd0s3d > > > what would the correct <regexp> look like? > > Is there any indication why problems seen on the RPI3 do not seem > apparent on an RPI2? A 2 GB USB flash swap partition seems to work > successfully on the Pi2. gstat and top/swapinfo are good for different things: gstat: for various I/O rates and such to the swap partition(s) top: for samples of how much swap space is in use (total). swapinfo: per swap partition swap space usage and the total. (swapinfo requires use of separate looping/sleeping for it to repeatedly report.) (swapinfo is a specialization/limitation of pstat.) There may be times when you want information about both aspects (I/O rates and usage-size figures from similar time frames). === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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