http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c1 --- Comment #1 from Moritz Duge --- P.S. The problem exists since the very first openSUSE-15.3 kernel (no updates) and still exists with the current openSUSE-15.3 kernel (Linux-5.3.18-59.27). -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c3 Alex Mantel changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mantel@pre-sense.de --- Comment #3 from Alex Mantel --- We can tell now, that it is definitely the combination of an NVMe SSD and the Leap 15.3 OS. Following notes: - Not every SSD is slow with Leap 15.3. - It is not the combination of mainboard + NVMe SSD. But a certain NVMe SSD only. - The NVMe SSD which slowed down is a "Micron NVMe Gen4" with the model "MTFDHBA256TCK". I would like to bisect the kernel patches applied to the Leap 15.3 kernel. Since it is a regression to Leap 15.2 a bisect seems suitable. I will apply following instructions to build the kernel. https://en.opensuse.org/openSUSE:Kernel_git Any thoughts on this? -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c5 --- Comment #5 from Alex Mantel --- (In reply to Daniel Wagner from comment #4)

(In reply to Alex Mantel from comment #3)

...

https://en.opensuse.org/openSUSE:Kernel_git

Any thoughts on this?

I didn't see any regressions, as you said it's a specific HW combination which show this problem. Highly appreciated that you try to bisect the problem. Thanks!

Hello Daniel, maybe i have a different understanding of the term "regression". The specific NVMe SSD worked with over ~800MB/s on OpenSUSE Leap 15.2 and now on Leap 15.3 with ~100MB/s. I'd say it's clearly a regression, since the SSD turned slow using the Leap 15.3's default kernel, as stated by @duge in comment #1. Isn't that a regression? Thanks, Alex -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c7 --- Comment #7 from Alex Mantel --- Hello Dominik, thanks for clarifying! I successfully bisected the commit on the following source "https://github.com/SUSE/kernel". The commit header looks as follows: commit 081d038020fa8cefe6d52e6b48464638c3d62fd3 (HEAD) Author: Hannes Reinecke Date: Fri Sep 11 15:22:13 2020 +0200 block: simplify set_init_blocksize (bsc#1175995,jsc#SLE-15608). suse-commit: 9020cc3ae7e79442df2836058b47ca1fe21ea772 I have a further question: Will the fix be applied to Leap 15.3 or do we have to build our kernel? Thank you! -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c9 --- Comment #9 from Alex Mantel --- Hello @kernel-bugs, i assume that for openSUSE this bug is a special, edge-case bug for specific hardware. But this bug is quite annoying and it took me some time to bisect the bug and provide the commit in comment#7. And I am worried that a fix is not applied in the near future. Can you provide some insights: Will the patch just be reverted? Can i expect the fix in 15.3 or can you estimate a date-range when the bug will be fixed? Thank you, Alex -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c11 --- Comment #11 from Alex Mantel --- Happy new year! Since this bug is still relevant, i would like to check back on it. Are there any news or can i help to speed up the process? Thank you, Alex -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c13 --- Comment #13 from Moritz Duge --- (In reply to Daniel Wagner from comment #12)

Hi Alex, Hannes should be back next week. Hopefully he is able to point to the missing upstream fix. Currently, I don't have any free cycles to investigate. Sorry.

Looks like upstream (kernel.org) simply reverted that commit a few month later. So SUSE should probably also apply that revert commit! Original upstream commit (2020-07-01): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h... Upstream revert (2021-01-27): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h... -- You are receiving this mail because: You are the assignee for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1191929 http://bugzilla.opensuse.org/show_bug.cgi?id=1191929#c15 --- Comment #15 from Moritz Duge --- (In reply to Daniel Wagner from comment #14)

[...] Sorry. I'll drop the offending patch from our kernels.

Thanks a lot for you help!

Thank you too! Can you give an estimation when the update will be available for openSUSE-LEAP-15.3 ? Alex and I are having a lot of work maintaining custom kernels for our systems. So a quick update would really help us! -- You are receiving this mail because: You are the assignee for the bug.