This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1774472
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1774472
Title:
hisi_sas: improve performance by optimizing DQ locking
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
The way the driver deals with locking the DQ causes performance to suffer.
[Test Case]
Run iozone3 and validate performance is >= previous.
[Fix]
Once a DQ slot is allocated, it must be used. So, currently the driver locks
the DQ while it builds and sends each task to the hardware, just in case there
is a failure, so that it can reuse that slot. However - there is a point at
which we the build/send is guaranteed to succeed, so we can release the lock at
that point allowing new slots to be allocated.
[Regression Risk]
All fixes are localized to the hisi_sas drivers, which are drivers for the
controllers in the hip06/hip07 SoCs, where we have directly tested these
updates.
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