[Bug 1111414] New: snapper's background comparison makes the system unusable
http://bugzilla.suse.com/show_bug.cgi?id=1111414 Bug ID: 1111414 Summary: snapper's background comparison makes the system unusable Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: YaST2 Assignee: yast2-maintainers@suse.de Reporter: fvogt@suse.com QA Contact: jsrain@suse.com Found By: --- Blocker: --- Multiple times the system became slowed down by snapper which used up most of the IO capacity of the hard drive and made the system unusable. strace showed that it was busy diffing kernel modules and sources. This could be improved massively by using the output of btrfs send to compare snapshots. -- You are receiving this mail because: You are on the CC list for the bug.
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Fabian Vogt
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Steffen Winterfeldt
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Arvin Schnell
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--- Comment #3 from Fabian Vogt
Snapper does already use btrfs send.
Then I wonder why snapper read the files from the snapshot and compared them manually. I'm not sure why snapper does this, is it just to determine whether a pre-post pair is empty and should be cleaned up? -- You are receiving this mail because: You are on the CC list for the bug.
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Stefan Hundhammer
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Takashi Iwai
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--- Comment #5 from Jeff Mahoney
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--- Comment #6 from Arvin Schnell
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--- Comment #7 from Arvin Schnell
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Jeff Mahoney
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Arvin Schnell
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--- Comment #9 from Arvin Schnell
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Arvin Schnell
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--- Comment #11 from Fabian Vogt
I had the chance to look at the issue now.
First thing to notice is that SLE15 is also affected while SLE12 SP4 is not affected.
AFAIS the change leading to the problem is in libbtrfs (4.11), but not even the patchlevel of libbtrfs was increased. On the other hand the patch for snapper should also work with the older libbtrfs.
AFAICT that's also what the comment on the PR (https://github.com/openSUSE/snapper/pull/438#issuecomment-429358392) says. So is there still a reason to not merge it?
David, can you please confirm this?
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Arvin Schnell
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Jeff Mahoney
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Arvin Schnell
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--- Comment #13 from Arvin Schnell
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Arvin Schnell
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--- Comment #15 from Arvin Schnell
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--- Comment #16 from Swamp Workflow Management
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--- Comment #17 from Swamp Workflow Management
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