** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-azure (Ubuntu Groovy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1904458
Title:
[linux-azure] Batch hibernate and resume IO requests
Status in linux-azure package in Ubuntu:
New
Status in linux-azure source package in Focal:
Fix Committed
Status in linux-azure source package in Groovy:
Fix Committed
Bug description:
[Impact]
Microsoft would like to request the following upstream commit in all
releases supported on Azure. This commit improves a signification
delay in hibernation/resume:
55c4478a8f0e("PM: hibernate: Batch hibernate and resume IO requests")
Details of this commit:
Hibernate and resume process submits individual IO requests for each page of
the data, so use blk_plug to improve the batching of these requests.
Testing this change with hibernate and resumes consistently shows
merging of the IO requests and more than an order of magnitude
improvement in hibernate and resume speed is observed.
One hibernate and resume cycle for 16GB RAM out of 32GB in use takes
around 21 minutes before the change, and 1 minutes after the change on
a system with limited storage IOPS.
[Test Case]
Follow the steps described here:
https://bugs.launchpad.net/ubuntu/+source/linux-
azure/+bug/1880032/comments/14
And compare the time need to save the instance state.
[Where problems could occur]
Considering the size of the patch and the code it touches, the most
likely issues are related to hibernation itself. Considering the
hibernation isn't officially support, any hibernation issues should
even considered regressions.
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