Public bug reported:
MSI-X support in the qla2xxx driver causes reproducible hangs under
moderate I/O load on our BladeCenter HS21 blades with QLogic ISP2422
fibre channel adapters.
product: IBM eServer BladeCenter HS21 -[8853GLU]-
08:01.0 Fibre Channel: QLogic Corp. ISP2422-based 4Gb Fibre Channel to PCI-X
HBA (rev 02)
We first experienced this behavior while mkfs(8)ing a large (5TB) ext3
filesystem on an otherwise unloaded system. The system apparently stops
handling interrupts and locks up tight, generally before 50% completion
(the exact percentage varies, but it happens every time). Disabling MSI
on the kernel command line with 'pci=nomsi' stops the lockups even under
much heavier I/O load.
FWIW, Red Hat has disabled MSI-X in (at least) RHEL5's kernel.
Unfortunately, the Red Hat bug cited in their kernel patch (252410) is
not publicly accessible.
>From kernel-2.6.18-92.1.10.el5.src.rpm's linux-2.6-scsi-qla2xxx-disable-
msi-x-by-default.patch:
From: Marcus Barrow <[EMAIL PROTECTED]>
Subject: [Bug 252410][QLOGIC 5.1 bug] qla2xxx MSI-X hardware issues on some
platforms
Date: Wed, 15 Aug 2007 20:22:09 -0400
Bugzilla: 252410
Message-Id: <[EMAIL PROTECTED]>
Changelog: [scsi] qla2xxx: disable MSI-X by default
Testing and upstream have found problems handling MSI-X by some
chipsets. These include major servers. Enabling MSI-X support
has caused a major regression on some machines.
This attached patch disable the MSI-X feature by default, but
allows enabling with a module parameter "ql2x_enable_msix".
It basically ammounts to one line, plus 5 lines to declare
the module parameter.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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MSI-X support in qla2xxx causes reproducible hangs under moderate I/O load
https://bugs.launchpad.net/bugs/268242
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