New: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition
https://bugzilla.kernel.org/show_bug.cgi?id=191471
Bug ID: 191471
Summary: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning
forever in the IRQ handler under load condition
Product: IO/Storage
Version: 2.5
Kernel Version: 4.7
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: SCSI
Assignee: [email protected]
Reporter: [email protected]
Regression: No
When there are a lot of IO requests queued for the HW, the IRQ handler of the mpxsas driver spins forever until all requests are serviced.
Spinning in the IRQ handler forever is a bad design and causes stalls on the other cores that is unrelated to this request.
A simple solution has been posted here but rejected by the maintainer as the maintainer has been looking to offload only the slow path to task context.
https://patchwork.kernel.org/patch/7579951/
Further requests for details to resolve the issue has been unanswered.
Logging the issue here for awareness.
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[Bug 191471] Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition
https://bugzilla.kernel.org/show_bug.cgi?id=191471
Timur Tabi ([email protected]) changed:
What |Removed |Added
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CC| |[email protected]
--- Comment #1 from Timur Tabi ([email protected]) --- Created attachment 255737
--> https://bugzilla.kernel.org/attachment.cgi?id=255737&action=edit
Propsed fix
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