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Subject: bug#46905: Add a note about ext4's dir_index to the manual
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--=-=-=
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Mainly a reminder to myself to do so.
Guix can break ext4, and more than once has, with a inscrutable
error message. We should document it explicitly.
See <http://logs.guix.gnu.org/guix/2021-03-03.log#220037>.
Kind regards,
T G-R
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Tobias Geerinckx-Rice <me@HIDDEN> Subject: bug#46905: Acknowledgement (Add a note about ext4's dir_index to the manual) Message-ID: <handler.46905.B.161480568820915.ack <at> debbugs.gnu.org> References: <87v9a89c8v.fsf@nckx> X-Gnu-PR-Message: ack 46905 X-Gnu-PR-Package: guix Reply-To: 46905 <at> debbugs.gnu.org Date: Wed, 03 Mar 2021 21:09:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 46905 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 46905: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D46905 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#46905: Add a note about ext4's dir_index to the manual
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Hi!
Tobias Geerinckx-Rice <me@HIDDEN> skribis:
> Mainly a reminder to myself to do so.
>
> Guix can break ext4, and more than once has, with a inscrutable error
> message. We should document it explicitly.
>
> See <http://logs.guix.gnu.org/guix/2021-03-03.log#220037>.
You wrote:
--8<---------------cut here---------------start------------->8---
<nckx>OK, that's the culprit (it's common: ext4 has a design flaw in that i=
t hashes directory entries and... just
dies when the hash table gets =E2=80=98full=E2=80=99). Try =E2=80=98tune2fs=
-E "hash_alg=3Dtea" /dev/foo=E2=80=99 to select a different hash algo, or
=E2=80=98tune2fs -O "^dir_index" /dev/foo=E2=80=99 to disable it completely=
if that doesn't help.
--8<---------------cut here---------------end--------------->8---
Really? I=E2=80=99ve almost always used =E2=80=98dir_index=E2=80=99 in my =
Guix + NixOS days,
and IIRC store accesses were much slower before that was a thing.
On berlin, /gnu is a 37=C2=A0TiB file system with =E2=80=98dir_index=E2=80=
=99 turned on and
it works well.
I don=E2=80=99t think we can claim there=E2=80=99s a design flaw. WDYT?
Ludo=E2=80=99.
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Subject: bug#46905: Add a note about ext4's dir_index to the manual
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--=-=-=
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Tobias Geerinckx-Rice =E5=86=99=E9=81=93=EF=BC=9A
> Mainly a reminder to myself to do so.
Update: I did a tiny bit of reading and came across the=20
=E2=80=98large_dir=E2=80=99 feature, which (as described) mitigates this pr=
oblem=20
somewhat.
Kind regards,
T G-R
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Subject: bug#46905: Add a note about ext4's dir_index to the manual
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Hi Ludo'!
I should note that later in the IRC convo I corrected my sloppy=20
=E2=80=98full=E2=80=99 to =E2=80=98hash collision=E2=80=99. Unfortunately =
it just returns an=20
already overloaded -ENOSPC to user space.
Ludovic Court=C3=A8s =E5=86=99=E9=81=93=EF=BC=9A
> IIRC store accesses were much slower before [dir_index] was a=20
> thing
Yes, it's a (t)horny dilemma :-/
> I don=E2=80=99t think we can claim there=E2=80=99s a design flaw. WDYT?
Fine; implementation flaw, then? Problem is, it's not like there=20
are other implementations than the one we're stuck with, so it=20
matters little what we call it.
Kind regards,
T G-R
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X-Loop: help-debbugs@HIDDEN
Subject: bug#46905: Add a note about ext4's dir_index to the manual
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Hi,
Tobias Geerinckx-Rice <me@HIDDEN> skribis:
> I should note that later in the IRC convo I corrected my sloppy =E2=80=98=
full=E2=80=99
> to =E2=80=98hash collision=E2=80=99. Unfortunately it just returns an al=
ready
> overloaded -ENOSPC to user space.
OK, but when do we get ENOSPC, then?
> Ludovic Court=C3=A8s =E5=86=99=E9=81=93=EF=BC=9A
[...]
>> I don=E2=80=99t think we can claim there=E2=80=99s a design flaw. WDYT?
>
> Fine; implementation flaw, then? Problem is, it's not like there are
> other implementations than the one we're stuck with, so it matters
> little what we call it.
My point is that we shouldn=E2=80=99t suggest that ext4 + dir_index is flaw=
ed
or unsuitable for Guix use, because we have strong evidence suggesting
otherwise. :-)
Now, I agree that if there are bugs or limitations hit in some
situations, we should document (or fix) them.
WDYT?
Thanks,
Ludo=E2=80=99.
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Hi,
can we close this issue or is there something we should document?
--
Ricardo
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Hi,
can we close this issue or is there something we should document?
--
Ricardo
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