Re: 3.7.8/amd64 full interrupt hangs due to iwlwifi under big nfs copies out

Eric Dumazet
2013-02-20T17:24:59Z

On Wed, 2013-02-20 at 18:01 +0100, Johannes Berg wrote:

> FWIW, I think just using order-0 pages and turning 8k A-MSDUs off by
> default makes more sense, A-MSDU is rarely used to begin with ...
>

My suggested patch makes sure that if someone needs 8k A-MSDU, iwlwifi
still works correctly.

> Also, if we copy larger frames here, we should also take into account
> the (variable) 802.11 header length to avoid copying into a position
> where the IP header ends up being unaligned.

But the current code already has this problem (if its a problem at all,
as on x86 NET_IP_ALIGN is 0)

I only increase available tailroom in the skb. Right now there is enough
room for IP and tcp headers.