Date: Sun, 7 Aug 2022 15:16:19 -0700 From: Mark Millard <marklmi@yahoo.com> To: "Dr. Rolf Jansen" <freebsd-rj@cyclaero.com> Cc: freebsd-arm <freebsd-arm@freebsd.org>, Glen Barber <gjb@freebsd.org>, Warner Losh <imp@bsdimp.com>, "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>, Ed Maste <emaste@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Looks like the arm 20220805 snapshots are still odd, so probably kern.geom.part.mbr.enforce_chs=0 was still in use Message-ID: <2016951A-BF16-4780-85FF-0B77E91FBBD4@yahoo.com> In-Reply-To: <99DC4046-AB8D-4D10-9475-94A8DC89DCFA@cyclaero.com> References: <A1AA705B-531D-45A2-9A1F-89F759550D3A@yahoo.com> <EA1CDEC5-A29E-43C5-9437-050CDBEC2233@freebsd.org> <6AF28022-A8E7-46B3-B64E-99D217E9B6AC@yahoo.com> <99DC4046-AB8D-4D10-9475-94A8DC89DCFA@cyclaero.com>
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> On 2022-Aug-7, at 14:51, Dr. Rolf Jansen <freebsd-rj@cyclaero.com> wrote:
>
>> Am 07.08.2022 um 16:50 schrieb Mark Millard <marklmi@yahoo.com>:
>>
>> On 2022-Aug-7, at 12:32, Glen Barber <gjb@freebsd.org> wrote:
>>
>>> Correct, it was set to “0” for these builds.
>>>
>>> I honestly do not have any idea where the problems you are seeing are creeping in.
>>>
>>> Should it be set back to “1”? I’m not sure how to proceed otherwise.
>>
>> My guess is that if the release/tools/arm.subr line:
>>
>> chroot ${CHROOTDIR} gpart add -t freebsd-ufs -a 64k ${mddev}s2
>>
>> was instead (note the added -b use):
>>
>> chroot ${CHROOTDIR} gpart add -t freebsd-ufs -b 64k -a 64k ${mddev}s2
>>
>> then the line:
>>
>> chroot ${CHROOTDIR} newfs -U -L rootfs /dev/${mddev}s2a
>>
>> would work as expected and things would still be aligned:
>> no aliasing of BSD vs. freebsd-ufs. (In part this is by
>> prior steps already having achieved alignment of BSD.)
>
> From a strict mathematical stand point of view, -a is not necessary when using -b with an aligned value.
"-a" controls more than the start offset: also the size.
QUOTE
-a alignment If specified, then the gpart utility tries to
align start offset and partition size to be
multiple of alignment value.
END QUOTE
I expect your statement would at most apply to the start offset, not to
everything "-a" does.
> Personally I don’t use the -a option of gpart anymore since it started to do funny magics in front of face. If I remember correct, gpart of the FreeBSD 9.x-RELEASES was still OK (or was it 8?). Nowadays, I align all my storage media by employing -b with a reasonable value.
>
I've no clue of the specifics that you are referencing and so can not check.
===
Mark Millard
marklmi at yahoo.com
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