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Windows Known Issues
Intermittent Link Loss and Degraded Performance at High Stress Can Occur on Windows Server
2012 Systems
In a Windows Server 2012-based system with multi-core processors, possible intermittent link loss and
degraded performance at high stress may occur due to incorrect RSS processor assignments. More
information and a Microsoft hotfix are available at:
http://support.microsoft.com/kb/2846837 .
Virtual machine loses link on a Microsoft Windows Server 2012 R2 system
On a Microsoft Windows Server 2012 R2 system with VMQ enabled, if you change the BaseRssProcessor
setting, then install Microsoft Hyper-V and create one or more virtual machines, the virtual machines may lose
link. Installing the April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
(2919355) and hotfix 3031598 will resolve the issue. See
http://support2.microsoft.com/kb/2919355 and
http://support2.microsoft.com/kb/3031598 for details.
DCB QoS and Priority Flow Control do not act as expected
If you use Microsoft’s Data Center Bridging (DCB) implementation configure Quality of Service (QoS) and
Priority Flow Control (PFC), the actual traffic flow segregation per traffic class may not match your
configuration and PFC may not pause traffic as expected. If you mapped more than one priority to a Traffic
Class, enabling only one of the priorities and disabling the others will work around the issue. Installing Intel’s
DCB implementation will also resolve this issue. This issue affects Microsoft Windows Server 2012 and
Server 2012 R2.
Link loss after changing the Jumbo Frames setting
Inside a guest partition on a Microsoft Windows Server 2012 R2 Hyper-V virtual machine, if you change the
jumbo frame Advanced setting on an Intel® X540 based Ethernet Device or associated Hyper-V NetAdapter,
you may lose link. Changing any other Advanced Setting will resolve the issue.
Virtual Machine Queues are not allocated until reboot
On a Microsoft Windows Server 2012 R2 system with Intel® Ethernet Gigabit Server adapters installed, if you
install Hyper-V and create a VM switch, Virtual Machine Queues (VMQ) are not allocated until you reboot the
system. Virtual machines can send and receive traffic on the default queue, but no VMQs will be used until
after a system reboot.
Application Error Event IDs 789, 790, and 791 in the Event Log
If Data Center Bridging (DCB) is enabled, and the enabled port loses link, the following three events may be
logged in the event log:
l
Event ID 789: Enhanced Transmission Selection feature on a device has changed to non-operational
l
Event ID 790: Priority Flow Control feature on a device has changed to non-operational
l
Event ID 791: Application feature on a device has changed to non-operational (FCoE)
This is the expected behavior when a DCB enabled port loses link. DCB will begin working again as soon as
link is reestablished. A port will lose link if the cable is disconnected, the driver or software package is
updated, if the link partner goes down, or for other reasons.
"Malicious script detected" Warning from Norton AntiVirus During PROSet Uninstall
The Intel PROSet uninstall process uses a Visual Basic script as part of the process. Norton AntiVirus and
other virus scanning software may mistakenly flag this as a malicious or dangerous script. Letting the script
run allows the uninstall process to complete normally.