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Date:      Sun, 07 Mar 2021 18:08:31 +0000
From:      Robert Crowston <crowston@protonmail.com>
To:        bob prohaska <fbsd@www.zefox.net>
Cc:        freebsd-arm <freebsd-arm@freebsd.org>, Mark Millard <marklmi@yahoo.com>
Subject:   Re: RPi4 Status and sysutils/rpi-firmware (and rng)
Message-ID:  <G5ZAfvg49jl5dj40HAnjmwoEKpVSuGp8KmiBrSY_EBLXou6UGBIjU3tVxUuPGKeCvXEovg2d3tqhIGOmQCyb7c3wKsUHJ8xrSasvwXfbqwk=@protonmail.com>
In-Reply-To: <67BF2EAC-04AD-4822-99B2-48A99563331F@yahoo.com>
References:  <BDF8C846-1CB3-421E-A8D5-25E0075C7106.ref@yahoo.com> <BDF8C846-1CB3-421E-A8D5-25E0075C7106@yahoo.com> <20210307021628.GA99890@www.zefox.net> <AAA4E495-4E9E-4C55-A07E-74D9737EC15B@yahoo.com> <20210307155515.GA4591@www.zefox.net> <67BF2EAC-04AD-4822-99B2-48A99563331F@yahoo.com>

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You can generate a test file with something like
head -c 8000000000 /dev/random > yourfile
md5 before and after to see if they are unchanged. That was how I did my te=
sting.

[As for MicroSD wear&tear: I keep hearing people talk about how unreliable =
these cards are, but when you ask for hard numbers about lifetime, no one h=
as any. I've had one SD card out of dozens fail on me, despite regularly dd=
'ing out entire cards -- this is a better failure rate than my mechanical h=
ard disks. SD cards are also very cheap. To me it seems like an irrelevant =
concern, unless you don't keep backups.]

=E2=80=94 RHC.

=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90 Original Me=
ssage =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90
On Sunday, 7 March 2021 16:46, Mark Millard via freebsd-arm <freebsd-arm@fr=
eebsd.org> wrote:

>
>
> On 2021-Mar-7, at 07:55, bob prohaska <fbsd atwww.zefox.net> wrote:
>
> > On Sat, Mar 06, 2021 at 09:30:33PM -0800, Mark Millard wrote:
> >
> > > I've not done the huge-file copy-corruption testing
> > > recently, and never with stable/13 or releng/13.0 or
> > > a 13.0-BETA*/RC* . I probably should try, booting
> > > a 13.0-RC* image as the context (other than the
> > > rpi-firmware replacements). I use a file that is
> > > notably bigger than the RAM.
> >
> > This is -current, chosen to be the latest offered.
> >
> > > Historically, if the corruption problems show up
> > > the technique to get a reliable environment was to
> > > restrict it to using 3 GiBytes, possibly via some
> > > text in config.txt . This also applied to the
> > > RPi4B 4 GiByte models.
> >
> > Might it be useful to attempt the huge-file corruption test?
> > This is a microSD-only setup, but it's a 32 GB card so there's
> > enough space for a file bigger than the 8 GB RAM. The most obvious
> > sticking point is need to manufacture a test file since there's
> > no ethernet. The second issue would be reporting; all I can
> > do is look at the screen and make manual notes. Enough for a
> > go/no-go test, not so good for details.
>
> For u-boot based booting the expected result with 8 GiBytes
> of RAM in use is that it would work fine: the problem was
> addressed for that kind of context. It is the ACPI type of
> booting that still has the known problem. For 13.0-RC1
> my u-boot booting based testing would be that the code has
> not reverted somehow.
>
> I tested 13.0-RC1 using the normal u-boot style of booting
> and it worked fine: no differences found.
>
> I tested my main c113740f266e based non-debug build (about
> 4 days old) and it worked fine as well.
>
> I do not see that you would gain much from repeating the
> tests on a microsd card. The wear-and-tear on the microsd
> media used and time might not be worth it. Sneakernet of a
> microsd card prepared elsewhere would be one technique
> of getting a large file in place. Another would be to
> compile a program and run it. What I did was to make a tar
> of an already huge directory tree that I had.
>
> Given the initial file, the test is simple: cp the file
> then diff the files. If the diff finds the files are
> different, then some problem happened, possibly the old
> DMA handling issue. If the diff finds the files are the
> same, then there is no evidence of the DMA handling
> problem.
>
> (cmp or the like could be used to see some about the
> differences if there were some.)
>
> I happened to use a file that was 11570948096 bytes
> long. (It was a tar of a dirrectory tree.)
>
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>
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
>
> freebsd-arm@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-arm
> To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"





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