From: Saeed Mahameed
> Sent: 31 January 2017 20:59
> From: Daniel Jurgens <dani...@mellanox.com>
> 
> There is a hardware feature that will pad the start or end of a DMA to
> be cache line aligned to avoid RMWs on the last cache line. The default
> cache line size setting for this feature is 64B. This change configures
> the hardware to use 128B alignment on systems with 128B cache lines.

What guarantees that the extra bytes are actually inside the receive skb's
head and tail room?

        David

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