Debian Bug report logs - #990092
kmod: Enable zstd support

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Andres Freund <andres@anarazel.de>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: kmod: Enable zstd support

Date: Sun, 20 Jun 2021 04:05:21 -0700

Package: kmod
Version: 28-1
Severity: wishlist

Hi,

Since version 28 kmod supports zstd compression [1]. As using xz module compression
makes building kernels painfully slow, and zstd achieves pretty decent ratios
at a much lower compression time, it would be good to have support for that
zstd in kmod.

Regards,

Andres Freund

[1] https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/commit/?id=3821e1971ec53fabbbb9f2679ea988ee12db61c8

-- System Information:
Debian Release: 11.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.13.0-rc6-andres-00267-g913ec3c22ef4 (SMP w/16 CPU threads)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages kmod depends on:
ii  libc6      2.31-12
ii  libkmod2   28-1
ii  liblzma5   5.2.5-2
ii  libssl1.1  1.1.1k-1
ii  lsb-base   11.1.0

kmod recommends no packages.

kmod suggests no packages.

-- no debconf information

Message #10 received at 990092@bugs.debian.org (full text, mbox, reply):

From: Marco d'Itri <md@Linux.IT>

To: Andres Freund <andres@anarazel.de>, 990092@bugs.debian.org

Subject: Re: Bug#990092: kmod: Enable zstd support

Date: Sun, 20 Jun 2021 23:26:35 +0200

[Message part 1 (text/plain, inline)]

On Jun 20, Andres Freund <andres@anarazel.de> wrote:

> Since version 28 kmod supports zstd compression [1]. As using xz module compression
> makes building kernels painfully slow, and zstd achieves pretty decent ratios
> at a much lower compression time, it would be good to have support for that
> zstd in kmod.
The Debian kmod package supports lzma, but has never enabled support for 
xz.
If you are interested to pursue this then please provide statistics 
(space saved, time and memory for compression and decompression) for
zstd and xz and use cases.

-- 
ciao,
Marco

[signature.asc (application/pgp-signature, inline)]

Message #15 received at 990092@bugs.debian.org (full text, mbox, reply):

From: Dimitri John Ledkov <dimitri.ledkov@canonical.com>

To: 990092@bugs.debian.org

Subject: Re: Bug#990092: kmod: Enable zstd support

Date: Mon, 31 Jan 2022 14:11:43 +0000

On Sun, 20 Jun 2021 23:26:35 +0200 Marco d'Itri <md@Linux.IT> wrote:
> On Jun 20, Andres Freund <andres@anarazel.de> wrote:
>
> > Since version 28 kmod supports zstd compression [1]. As using xz module compression
> > makes building kernels painfully slow, and zstd achieves pretty decent ratios
> > at a much lower compression time, it would be good to have support for that
> > zstd in kmod.
> The Debian kmod package supports lzma, but has never enabled support for
> xz.

These days, lzma/xz support is combined into one, and thus currently
kmod in sid does provide support for xz

(sid-amd64)root@ottawa:~# dpkg-query -W kmod
kmod 29-1
(sid-amd64)root@ottawa:~# kmod --version
kmod version 29
-ZSTD +XZ -ZLIB +LIBCRYPTO -EXPERIMENTAL

> If you are interested to pursue this then please provide statistics
> (space saved, time and memory for compression and decompression) for
> zstd and xz and use cases.

zstd offers lower memory usage, lower cpu time usage, whilst having
decent compression ratios (less than xz, but more than anything else).
Overall the speed of zstd outperforms the compression ratio loss as
has been measured multiple times in terms of boot speed context.

libzstd would not be an additional dependency on most systems, as
libapt-pkg6.0 already depends on libzstd.

Please consider enabling libzstd support.

Regards,

Dimitri.

Message #20 received at 990092-close@bugs.debian.org (full text, mbox, reply):

From: Debian FTP Masters <ftpmaster@ftp-master.debian.org>

To: 990092-close@bugs.debian.org

Subject: Bug#990092: fixed in kmod 30+20220630-1

Date: Sun, 03 Jul 2022 11:51:47 +0000

Source: kmod
Source-Version: 30+20220630-1
Done: Marco d'Itri <md@linux.it>

We believe that the bug you reported is fixed in the latest version of
kmod, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 990092@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Marco d'Itri <md@linux.it> (supplier of updated kmod package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sun, 03 Jul 2022 13:28:18 +0200
Source: kmod
Architecture: source
Version: 30+20220630-1
Distribution: unstable
Urgency: medium
Maintainer: Marco d'Itri <md@linux.it>
Changed-By: Marco d'Itri <md@linux.it>
Closes: 990092 993297 1000659 1009349
Changes:
 kmod (30+20220630-1) unstable; urgency=medium
 .
   * New upstream snapshot.
   * Enabled support for zstd. (Closes: #990092)
   * kmod.postinst: removed code to handle upgrades from Debian <= 8.
     (Closes: #1009349, #1000659)
   * Changed the $PATH in the init script to include /usr/. (Closes: #993297)
   * Enabled the test suite.
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