On 08/22/2012 12:15 AM, Eric Dumazet wrote:

This particular commit is the start of a patches batch that ended in the
generic TCP coalescing mechanism.

It is known to have problem on drivers doing skb_clone() in their rx
path.

Current kernels should be ok, because coalescing doesnt happen if the
destination skb is cloned (skb_cloned(to) in skb_try_coalesce())

The skb_clone() call is not the source of the problem for r8712u, as it is only 
used when a memory allocation fails, which is not happening. The suggestion did 
lead to another patch that I had been preparing. The initial allocation of RX 
buffers used a size of 30720 bytes, while 9100 is sufficient to allow 
aggregation. Upon reducing the buffer size, the driver now works for me. I am 
now awaiting tests by the OP on the Red Hat bugzilla before sending the patch 
upstream.

So far, no ideas for the problem in connecting to WPA1 networks.

Larry