Hi, it does not look you follow the formal "Changes policy". The process for submitting change proposals is described here:
https://docs.fedoraproject.org/en-US/program_management/changes_policy/ Vít Dne 05. 01. 20 v 13:23 Bohdan Khomutskyi napsal(a): > > > Summary > > Improve compression ratio of SquashFS filesystem on the installation > media. > > > Owner > > Name: Bohdan Khomutskyi > > Email: bkhom...@redhat.com <mailto:bkhom...@redhat.com> > > > Current status > > Targeted release: I propose this change for Fedora 32 > > Last updated: Jan 5 2020 > > Pagure.io issue: https://pagure.io/releng/issue/9127 > > I was unable to create an article in Fedora wiki system. > > > Detailed Description > > As of Fedora 31, the LiveOS/squashfs.img file on the installation > image, is compressed with default settings of mksquashfs. The standard > configuration is set to XZ algorithm with block size of 128k andBCJ > filter enabled. Those parameters can be adjusted which will lead to a > better compression ratio and/or reduction of the CPU usage at build time. > > This is simple to achieve. Recently, Lorax has gotten support[1] for > adjusting the compression options for mksquashfs via the configuration > file. The file should be altered as following: > > [compression] > bcj = yes > args = -b 1M -Xdict-size 1M -no-recovery > > Where -b 1M and -Xdict-size 1M are block and dictionary sizes > respectively. Could be adjusted. > > > Benefit to Fedora > > * > > Reduction of the installation media size and the cost of storing > and distributing Fedora. > > * > > Reduction of the CPU usage at build time. Depending on which > compression parameters chosen. > > * > > See a graphical detail at https://pagure.io/releng/issue/9127. > > > Scope > > * > > Proposal owners: > > The build environment should have support for adjusting the Lorax > configuration file.. Lorax is a program that produces the > LiveOS/squashfs.img file on the installation media. > > One of the way to allow for such customization, is to add a feature in > Pungi, to allow for passing -c option to Lorax. > > * > > Release engineering: #9127 <https://pagure.io/releng/issue/9127> > > * > > Policies and guidelines: N/A > > * > > Trademark approval: N/A > > > Upgrade/compatibility impact > > * > > This change comes at a cost of higher memory usage during the > installation. Based on my personal estimations, this should not be > the issue. Since the decompression should require up to 1MiB per > thread. > > > User Experience > > * > > Increasing the block size on the current configuration with EXT4 > file system, should increase latency while accessing the EXT4 > filesystem. The exact impact is to be evaluated. > > * > > The impact of latency will be reduced, if the plain SquashFS > option is be choosen. > > > Dependencies > > * > > N/A > > > Contingency Plan > > * > > N/A > > > Documentation > > https://pagure.io/releng/issue/9127. > > mksquashfs(1) > > > Release notes > > > See also > > https://pagure.io/releng/issue/8646 > > -- > > Bohdan Khomutskyi > > Release Configuration Management engineer > Red Hat > > > _______________________________________________ > devel mailing list -- devel@lists.fedoraproject.org > To unsubscribe send an email to devel-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
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