Public bug reported:
In bug 1818138, the config option CONFIG_NO_HZ_FULL was requested to be
enabled in the linux-azure kernels(currently 4.15 and 4.18) in order to
increase NVME disks performance.
To achieve the peak IOPs we are seeing in testing, the following commit is also
needed:
7ac257b862f2c (“blk-mq: remove the request_list usage”)
This commit cleans up unused code in block-mq (mq uses pre-allocated
tags to allocate request, not request_list as it's used only in legacy
queue). The commit saves a bunch of rcu locks on I/O queuing path,
which increases the achievable IOPs seen in testing.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel-hyper-v
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https://bugs.launchpad.net/bugs/1819689
Title:
[linux-azure] Commit To Improve NVMe Performance
Status in linux-azure package in Ubuntu:
New
Bug description:
In bug 1818138, the config option CONFIG_NO_HZ_FULL was requested to
be enabled in the linux-azure kernels(currently 4.15 and 4.18) in
order to increase NVME disks performance.
To achieve the peak IOPs we are seeing in testing, the following commit is
also needed:
7ac257b862f2c (“blk-mq: remove the request_list usage”)
This commit cleans up unused code in block-mq (mq uses pre-allocated
tags to allocate request, not request_list as it's used only in legacy
queue). The commit saves a bunch of rcu locks on I/O queuing path,
which increases the achievable IOPs seen in testing.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1819689/+subscriptions
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