** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
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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:
In Progress
Status in linux source package in Bionic:
In Progress
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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