Messages in this thread | | | Subject | Reiser4 SFRN 4.0.2 issues with kernel 5.15 | Date | Wed, 26 Jan 2022 01:09:05 -0800 (PST) | From | Metztli Information Technology <> |
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Niltze Ed-
On Thu, Dec 23, 2021 at 10:47 AM Metztli Information Technology <jose.r.r@metztli.com> wrote: > > Niltze [Hello]- > > Attached is a Reiser4 -enabled Debian packaging hack for Linux 5.14.21- > 1 EOL: metztli-reiser4-gcc10-debian-packaging-for-5.14.21-1EOL.patch > > For a one off, we can fetch the Debian packaging for 5.14.16-1, the > last one that Debian released, as: > > git clone --depth 1 -b debian/5.14.16-1 --single-branch > https://anonscm.debian.org/git/kernel/linux.git > > Customize your branch: > git switch -c <new-branch-name> > > fetch the 5.14.21 EOL kernel source, etc. > wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.14.21.tar.xz > https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.14.21.tar.sign > > Verify: > xz -dc linux-5.14.21.tar.xz | gpg --verify linux-5.14.21.tar.sign - > > Make a sym link to feed it to debian: > ln -s linux-5.14.21.tar.xz linux_5.14.21.orig.tar.xz > > Change directory: > cd linux > > Apply metztli-reiser4-gcc10-debian-packaging-for-5.14.21-1EOL.patch > > Debianize your kernel source tree: > debian/rules orig > > Apply either of Ed's modified patch for 5.14: > metztli-reiser4-stable-for-5.14.patch.gz > OR > metztli-reiser4-unstable-for-5.14.patch.gz > > Of course, we assume -- a priori -- development environment. > > Snapshot of the hack in an AMD Ryzen bare metal server: > https://metztli.it/bullseye-reiser5/reiser4-sfrn4-5.14.20-1-amd.png > > Hack is currently working in a couple of physical hardware instances > but there are **no implicit nor explicit warranties.** []
I have been stuck with upgrading your reiser4 SFRN4 stable patch to make it work with kernel 5.15.xy; although I am able to build the patched kernel successfully, once I install it under a local Debian Bullseye AMD64 testing instance, I experience considerable latency during certain operations, most noticeably running firefox 96.0.2 and/or its offshoot suite Seamonkey < https://www.seamonkey-project.org/start/ >, etc..
Of course, it is because kernel code changes from 5.14 to 5.15; more specifically the reiser4 -patched files below seem to be an issue:
fs/fs-writeback.c fs/read_write.c include/linux/fs.h mm/filemap.c mm/page-writeback.c mm/vmscan.c
I have used vim -Rd to compare the relevant files in a reiser4 sfrn4 -patched kernel 5.14.21 EOL, executing where I am writing this email, and the reiser4 sfrn4 -patched kernel 5.15.6, where considerable latency issues are being experienced.
Attached, please find gzip archives with the files of reference from 5.14.21 and 5.15.6: reiser4-sfrn4-linux-5.14.21-vs-5.15.6.tar.gz
as well as the patch that I applied onto both kernels: metztli-reiser4-stable-for-5.14.patch.gz
If you have some free time, I would appreciate it if you could take a look at those.
Best Professional Regards.
-- -- Jose R R http://metztli.it ----------------------------------------------------------------------- ---------------------- Download Metztli Reiser4: Debian Bullseye w/ Linux 5.14.21 AMD64 ----------------------------------------------------------------------- ---------------------- feats ZSTD compression https://sf.net/projects/metztli-reiser4/ ----------------------------------------------------------------------- ---------------------- or SFRN 5.1.3, Metztli Reiser5 https://sf.net/projects/debian-reiser4/ ----------------------------------------------------------------------- -------------------- Official current Reiser4 resources: https://reiser4.wiki.kernel.org/
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