On Sun, Jan 19, 2020 at 4:42 PM Bohdan Khomutskyi <bkhom...@redhat.com> wrote:
> Hello, > > Thanks everyone for posting feedback. > More benchmarking results are available at > https://fedoraproject.org/wiki/Category:Changes/OptimizeSquashFS, > including the 'plain' SquashFS filesystem. > After performing the tests, I personally recommend to use xz compression > with 1MiB block size, without bcj, on a 'plain' squash filesystem -- this > will lead to a reduction of 142MiB on the ISO, compared to the stock Fedora > 31 Workstation x86_64 image. > Alternative compression options, such as Zstd, are also mentioned in the > change proposal. > Hmm, and I see I've been completely confused in my last reply, and I considered the numbers in the first image [1] to be installation times. Instead they are image creation times. OK. Looking at the new second image [2], Zstd seems like a clear winner to me at least for QA purposes. With fine tuning the compression level, we can achieve almost the same file size for a great installation speedup. [1] https://fedoraproject.org/wiki/File:Compression_vs_SquashFS_creation_time.png [2] https://fedoraproject.org/wiki/File:Compression_vs_installation_time.png
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