Red Hat Enterprise Linux: Does KVM support VMDq feature?

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 5 or 6

Issue

  • Does KVM support VMDq (Virtual Machine Device Queues) on Red Hat Enterprise Linux (RHEL)?

Resolution

  • During the time that this document was created, there is no supported for this feature.

Root Cause

  • This feature is not supported even in upstream kernel, so we don't have this support.

Diagnostic Steps

  • To identify if upstream code support such feature, tried to locate it through kernel ChangeLog.
# ls

ChangeLog-2.6.30    ChangeLog-2.6.32  ChangeLog-2.6.35  
ChangeLog-2.6.31    ChangeLog-2.6.33  ChangeLog-2.6.36  
ChangeLog-2.6.31.1  ChangeLog-2.6.34  geLog-2.6.37
  • ChangeLog-2.6.30 is around Jun/2009.
# grep -rni VMDq   
ChangeLog-2.6.30:135093: - Fix an 82598 initialization of RDRXCTL when depending on RSS and VMDq to  
ChangeLog-2.6.30:164705: igb: add pf side of VMDq support  
ChangeLog-2.6.30:164707: Add the pf portion of vmdq support.  This provides enough support so that  
ChangeLog-2.6.30:164708: VMDq is enabled, and the pf is functional without enabling vfs.  
ChangeLog-2.6.33:169344: remaining queues will be allocated out of other VMDq pools.  
ChangeLog-2.6.34:151304: or VMDq  
ChangeLog-2.6.35:92398:  \* get\_san\_mac\_addr, check\_link, set\_vmdq, clear\_vmdq, clear_vfta,  
ChangeLog-2.6.37:168617: ixgbe: fix TX ring enable issues seen when VMDQ is enabled  
ChangeLog-2.6.37:168620: VMDQ was enabled we were trying to enable TX rings before setting the VFTE

  • There is a RFC from intel:
    http://lwn.net/Articles/350086/

  • Also, a thread below but there is no patches:
    http://www.mail-archive.com/kvm@vger.kernel.org/msg21850.html

  • We have raised an internal feature request for this.

  • Component
  • kvm

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