Public bug reported:
SRU Justification
[Impact]
* Microsoft requested patch to improve efficiency of SCSI I/O on Hyper-V
by issuing IO on same CPU as return CPU.
[Fix]
* clean cherry-pick of linux-next patch:
* b69ffeaa0ae4: "scsi: storvsc: Prefer returning channel with the same CPU
as on the I/O issuing CPU"
[Test Plan]
* Compile tested
* Microsoft to test
[Regression potential]
* Patch limited to SCSI module. Possible regressions could result in
unexpected performance desegregation in non-Hyper-V cases.
[Other info]
* SF#00420316
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Plucky)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Description changed:
SRU Justification
[Impact]
* Microsoft requested patch to improve efficiency of SCSI I/O on Hyper-V
by issuing IO on same CPU as return CPU.
[Fix]
- * clean cherry-pick of upstream patch:
- * b69ffeaa0ae4: "scsi: storvsc: Prefer returning channel with the same
CPU as on the I/O issuing CPU"
+ * clean cherry-pick of linux-next patch:
+ * b69ffeaa0ae4: "scsi: storvsc: Prefer returning channel with the same
CPU as on the I/O issuing CPU"
[Test Plan]
* Compile tested
* Microsoft to test
[Regression potential]
* Patch limited to SCSI module. Possible regressions result in
unexpected performance desegregation in non-Hyper-V cases.
[Other info]
* SF#00420316
** Description changed:
SRU Justification
[Impact]
* Microsoft requested patch to improve efficiency of SCSI I/O on Hyper-V
by issuing IO on same CPU as return CPU.
[Fix]
* clean cherry-pick of linux-next patch:
* b69ffeaa0ae4: "scsi: storvsc: Prefer returning channel with the same
CPU as on the I/O issuing CPU"
[Test Plan]
* Compile tested
* Microsoft to test
[Regression potential]
- * Patch limited to SCSI module. Possible regressions result in
+ * Patch limited to SCSI module. Possible regressions could result in
unexpected performance desegregation in non-Hyper-V cases.
[Other info]
* SF#00420316
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2128842
Title:
[STORVSC] [Backport] Backport for Linux storage driver patch for
fixing performance issues
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https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2128842/+subscriptions
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