On 12 Feb 2012, at 00:02, muayad y wrote:

> when maxPacketSize has been uncommented, it did change  rx_connection struct 
> behavoir,  rx_connection is being called on vos (userspace code)

The question is why this change actually improves performance - we need to 
understand that, so we can tell whether we also need to look at other 
structures and see if there are problems with them.

The question at the moment is whether this is a variable alignment issue (which 
would be surprising, as the x86_64 ABI specifies that all pointers should be 
aligned on 8 byte boundaries), or something more subtle, possibly related to 
cache line usage. The other possibility is that this is something entirely 
coincidental, not related to your code change at all. Further investigation is 
required.

Cheers,

Simon.

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