* [Bug 191471] New: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition
@ 2016-12-29 15:16 bugzilla-daemon
2017-04-03 15:31 ` [Bug 191471] " bugzilla-daemon
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla-daemon @ 2016-12-29 15:16 UTC (permalink / raw)
To: linux-scsi
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: linux-scsi@vger.kernel.org
Reporter: okaya@codeaurora.org
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
2016-12-29 15:16 [Bug 191471] New: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition bugzilla-daemon
@ 2017-04-03 15:31 ` bugzilla-daemon
0 siblings, 0 replies; 2+ messages in thread
From: bugzilla-daemon @ 2017-04-03 15:31 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=191471
Timur Tabi (timur@codeaurora.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |timur@codeaurora.org
--- Comment #1 from Timur Tabi (timur@codeaurora.org) ---
Created attachment 255737
--> https://bugzilla.kernel.org/attachment.cgi?id=255737&action=edit
Propsed fix
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2016-12-29 15:16 [Bug 191471] New: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition bugzilla-daemon
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