** Also affects: linux-azure (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Xenial)
Importance: Undecided
Status: New
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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
Status in linux-azure source package in Xenial:
New
Status in linux-azure source package in Cosmic:
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.
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