** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
hisi_sas: improve performance by optimizing DQ locking
Status in linux package in Ubuntu:
Status in linux source package in Bionic:
The way the driver deals with locking the DQ causes performance to suffer.
Run iozone3 and validate performance is >= previous.
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.
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
To manage notifications about this bug go to:
Mailing list: https://launchpad.net/~kernel-packages
Post to : firstname.lastname@example.org
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp