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mmap writes are slow on Linux 4.2+, xfstests generic/074 hangs #11

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rfjakob opened this issue Dec 11, 2015 · 7 comments
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mmap writes are slow on Linux 4.2+, xfstests generic/074 hangs #11

rfjakob opened this issue Dec 11, 2015 · 7 comments
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rfjakob commented Dec 11, 2015

Or maybe runs really slow? Will investigate next week.
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rfjakob commented Dec 16, 2015

Seems to be a kernel writeback issue. This affects all FUSE filesystems, but is fixed in v4.4-rc5-18-gedb42dc .

fuse-devel thread: http://news.gmane.org/find-root.php?message_id=CAPv9Zmm7WOQvMTTJjvxgXfRXzF7nes5zmJvnAo7GKqY7muWwhA%40mail.gmail.com

@rfjakob rfjakob closed this as completed Dec 16, 2015
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rfjakob commented Dec 17, 2015

Nope, just took longer to trigger it.

@rfjakob rfjakob reopened this Dec 17, 2015
@rfjakob rfjakob changed the title xfstests generic/074 hangs mmap writes are slow on 4.2+ - xfstests generic/074 hangs Jan 24, 2016
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rfjakob commented Jan 24, 2016

Posted to linux-kernel ( http://thread.gmane.org/gmane.linux.kernel/2132944 ), no replies so far.

@rfjakob rfjakob changed the title mmap writes are slow on 4.2+ - xfstests generic/074 hangs mmap writes are slow on 4.2+, xfstests generic/074 hangs Jan 24, 2016
@rfjakob rfjakob changed the title mmap writes are slow on 4.2+, xfstests generic/074 hangs mmap writes are slow on Linux 4.2+, xfstests generic/074 hangs Mar 15, 2016
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rfjakob commented Apr 27, 2016

The mailing thread has continued here: http://thread.gmane.org/gmane.comp.file-systems.fuse.devel/15129 , fix has been written: https://lkml.org/lkml/2016/3/10/21

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rfjakob commented Apr 27, 2016

Patch: https://patchwork.kernel.org/patch/8554181/

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rfjakob commented May 13, 2016 •
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Patch landed in Linux 4.6-rc7: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=74d369443325063a5f0260e63971decb950fd8fa

Linux v4.4.10 and v4.5.4 final (currently in review as
4.4.10-rc1/4.5.4-rc1) will have it, too.

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rfjakob commented Jun 30, 2016

Fedora 24 ships with kernel 4.5.7, considering this solved.

@rfjakob rfjakob closed this as completed Jun 30, 2016
@rfjakob rfjakob mentioned this issue Nov 21, 2017
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