Public bug reported:
SRU Justification
[Impact]
It's inefficient to ring the doorbell page every time a WQE is posted to
the received queue. Excessive MMIO writes result in CPU spending more
time waiting on LOCK instructions (atomic operations), resulting in
poor scaling performance.
[Test Plan]
MSFT tested.
[Regression Potential]
The MANA receive queue could stop.
[Other Info]
SF: #00363437
These 2 patches have been submitted for upstream inclusion.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Jammy)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Affects: linux-azure (Ubuntu Lunar)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Package changed: linux (Ubuntu) => linux-azure (Ubuntu)
** Changed in: linux-azure (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux-azure (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu Jammy)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux-azure (Ubuntu Lunar)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu Lunar)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux-azure (Ubuntu Lunar)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/2027615
Title:
Azure: MANA: Fix doorbell access for receives
Status in linux-azure package in Ubuntu:
New
Status in linux-azure source package in Jammy:
In Progress
Status in linux-azure source package in Lunar:
In Progress
Bug description:
SRU Justification
[Impact]
It's inefficient to ring the doorbell page every time a WQE is posted to
the received queue. Excessive MMIO writes result in CPU spending more
time waiting on LOCK instructions (atomic operations), resulting in
poor scaling performance.
[Test Plan]
MSFT tested.
[Regression Potential]
The MANA receive queue could stop.
[Other Info]
SF: #00363437
These 2 patches have been submitted for upstream inclusion.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2027615/+subscriptions
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