On 1/13/2010 4:09 PM, Jarek Poplawski wrote:

On Wed, Jan 13, 2010 at 03:39:37PM -0500, Michael Breuer wrote:
   

quoted

Just an FYI - 2.6.32.3 with alt 3 af_packet patch&  sky2
pskb_may_pull runs OK with DMAR (re)enabled and msi enabled.
     

Hmm... What a pity! It was such a useful debugging tool for
networking ;-) BTW, I'm not sure if "runs OK" means with or without
those DHCP drops&  large packets you described.

Thanks,
Jarek P.
   

As of now, no errors even when blasting traffic & forcing dhcp packets 
as before. I haven't tried putting mtu back to 9k yet. OK means that 
there are no obvious differences in behavior with or without DMAR all 
else being equal.

There were some updates made to stable that could have fixed this - I'd 
guess intel_iommu fixes helped.

If it helps, I'm still getting one error without DMAR enabled - at 
startup, there's a DMA sync oops - mismatch of 72 bytes coming from 
sky2. That oops was posted previously - with DMAR (re) enabled, there's 
no related oops.