GNU bug report logs - #46905
Add a note about ext4's dir_index to the manual

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Package: guix; Reported by: Tobias Geerinckx-Rice <me@HIDDEN>; dated Wed, 3 Mar 2021 21:09:02 UTC; Maintainer for guix is bug-guix@HIDDEN.

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From: Ricardo Wurmus <rekado@HIDDEN>
To: Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@HIDDEN>
Subject: Re: bug#46905: Add a note about ext4's dir_index to the manual
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Hi,

can we close this issue or is there something we should document?

-- 
Ricardo




Information forwarded to bug-guix@HIDDEN:
bug#46905; Package guix. Full text available.

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Subject: Re: bug#46905: Add a note about ext4's dir_index to the manual
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Hi,

can we close this issue or is there something we should document?

-- 
Ricardo




Information forwarded to bug-guix@HIDDEN:
bug#46905; Package guix. Full text available.

Message received at 46905 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tobias Geerinckx-Rice <me@HIDDEN>
Subject: Re: 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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bug#46905; Package guix. Full text available.

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From: Tobias Geerinckx-Rice <me@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#46905: Add a note about ext4's dir_index to the manual
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--=-=-=
Content-Type: text/plain; charset=utf-8; format=flowed
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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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From: Tobias Geerinckx-Rice <me@HIDDEN>
To: Bug reports for GNU Guix <bug-guix@HIDDEN>
Subject: Re: Add a note about ext4's dir_index to the manual
References: <87v9a89c8v.fsf@nckx>
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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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Information forwarded to bug-guix@HIDDEN:
bug#46905; Package guix. Full text available.

Message received at 46905 <at> debbugs.gnu.org:


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To: Tobias Geerinckx-Rice <me@HIDDEN>
Subject: Re: bug#46905: Add a note about ext4's dir_index to the manual
References: <87v9a89c8v.fsf@nckx>
Date: Thu, 04 Mar 2021 23:01:26 +0100
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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.




Information forwarded to bug-guix@HIDDEN:
bug#46905; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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--=-=-=
Content-Type: text/plain; format=flowed

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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--=-=-=--




Acknowledgement sent to Tobias Geerinckx-Rice <me@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#46905; Package guix. Full text available.
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