From: bugzilla-daemon@bugzilla.kernel.org
To: linux-scsi@vger.kernel.org
Subject: [Bug 191471] New: Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition
Date: Thu, 29 Dec 2016 15:16:46 +0000 [thread overview]
Message-ID: <bug-191471-11613@https.bugzilla.kernel.org/> (raw)
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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next reply other threads:[~2016-12-29 15:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-29 15:16 bugzilla-daemon [this message]
2017-04-03 15:31 ` [Bug 191471] Mp2Sas and Mpt3Sas (now mpxsas) drivers are spinning forever in the IRQ handler under load condition bugzilla-daemon
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