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** Changed in: linux
Importance: Unknown = Medium
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https://bugs.launchpad.net/bugs/543617
Title:
Unmount of an fs with dirty cache buffers causes pathological slowdown
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** Changed in: linux
Status: Unknown = Fix Released
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https://bugs.launchpad.net/bugs/543617
Title:
Unmount of an fs with dirty cache buffers causes pathological slowdown
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** Branch linked: lp:ubuntu/lucid-proposed/linux-ec2
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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ubuntu-bugs
** Branch linked: lp:ubuntu/lucid-proposed/linux-mvl-dove
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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This bug was fixed in the package linux - 2.6.32-25.44
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linux (2.6.32-25.44) lucid-proposed; urgency=low
[ Brad Figg ]
* SAUCE: (no-up) Modularize vesafb -- fix initialization
- LP: #611471
[ Stefan Bader ]
* Revert SAUCE: sync before umount to reduce time taken by
** Tags added: verification-done
** Tags removed: verification-needed
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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We need some testing of the proposed kernel to see whether this has been
resolved - please see comment #35 for information about how to get the
proposed kernel.
Thanks
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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I can report that the proposed kernel resolves what is either this issue or a
closely related
issue. On our Ubuntu 10.04 machines, unmounting an NFS filesystem takes a
significant
amount of time, on the order of several seconds to tens of seconds; my test
machine runs
between 15 seconds and 25
** Branch linked: lp:ubuntu/linux-mvl-dove
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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Also look for writeback in
Bug #543617
Bug #585092
Bug #601361
Bug #620242
Bug #628047
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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Accepted linux into lucid-proposed, the package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!
** Tags added: verification-needed
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SRU Justification
Impact: The upstream process for stable tree updates is quite similar in
scope to the Ubuntu SRU process, e.g., each patch has to demonstrably
fix a bug, and each patch is vetted by upstream by originating either
directly from Linus' tree or in a minimally backported form of
A batch of backported patches from upstream and the revert of the SAUCE
patch to minimize umount times has been committed to the repo. At the
moment updated kernels will only be available from https://launchpad.net
/~kernel-ppa/+archive/pre-proposed until the current kernel in proposed
clears to
Steve:
Well, your kernel certainly avoided the slowness I was experiencing in
unmounting bindmounts, though in fairness merely reverting the SAUCE
would most likely have been all I needed.
Unfortunately your kernel somehow made compiz refuse to start, which is
pretty weird.
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Unmount of an fs
I have test kernels built with two candidate patches, the kernels are here:
http://kernel.ubuntu.com/~sconklin/kernels-bug543617/
Please test and report.
The branch I built this from is here:
http://kernel.ubuntu.com/git?p=sconklin/ubuntu-lucid.git;a=shortlog;h=refs/heads/bug543617
I'll add the
** Patch added: writeback-fix-WB_SYNC_NONE-writeback-from-umount
http://launchpadlibrarian.net/52597988/1-2-writeback-fix-WB_SYNC_NONE-writeback-from-umount.patch
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
You received
** Patch added:
writeback-ensure-that-WB_SYNC_NONE-writeback-with-sb-pinned-is-sync
http://launchpadlibrarian.net/52597999/2-2-writeback-ensure-that-WB_SYNC_NONE-writeback-with-sb-pinned-is-sync.patch
** Changed in: linux (Ubuntu)
Assignee: Surbhi Palande (csurbhi) = Steve Conklin
Um, the test kernels don't have the bad patch reverted. I'll rebuild and
get new ones up.
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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Bugs, which is
Patch 5e1941884c700b7b97bcad52c2d8212ac56a7ebc. must be reverted in
addition to applying these two patches
** Changed in: linux (Ubuntu Lucid)
Status: Fix Released = In Progress
** Changed in: linux (Ubuntu)
Status: Fix Released = In Progress
** Changed in: linux (Ubuntu)
ok, once more with feeling!
I have test kernels built with two candidate patches, the kernels are here:
http://kernel.ubuntu.com/~sconklin/kernels-bug543617/
This time the incorrect patch has been reverted also.
Please test and report.
The branch I built this from is here:
** Tags added: patch
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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The fixes referred to in bug #585092 seem to have introduced regressions
and are currently reverted.
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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I've submitted an additional bug for the tmpfs regression,
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/585092
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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The committed workaround for this syncs _all_ filesystems on _any_ umount(), if
I understand it correctly.
This has caused a regression for us; some of our scripts mount a tmpfs and
then umount it. Since that now syncs every filesystem, it can take much
longer than it should.
What is the status
** Summary changed:
- Unmount of an fs with dirty cache buffers deadlocks
+ Unmount of an fs with dirty cache buffers causes pathological slowdown
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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I wonder if this was the cause of the 25x slowdown of apache as reported
by Phoronix: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/567302
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Unmount of an fs with dirty cache buffers causes pathological slowdown
https://bugs.launchpad.net/bugs/543617
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