From: Herbert Xu <[email protected]>
Date: Wed, 14 Nov 2007 19:48:44 +0800
> [TCP]: Fix size calculation in sk_stream_alloc_pskb
>
> We round up the header size in sk_stream_alloc_pskb so that
> TSO packets get zero tail room. Unfortunately this rounding
> up is not coordinated with the select_size() function used by
> TCP to calculate the second parameter of sk_stream_alloc_pskb.
>
> As a result, we may allocate more than a page of data in the
> non-TSO case when exactly one page is desired.
>
> In fact, rounding up the head room is detrimental in the non-TSO
> case because it makes memory that would otherwise be available to
> the payload head room. TSO doesn't need this either, all it wants
> is the guarantee that there is no tail room.
>
> So this patch fixes this by adjusting the skb_reserve call so that
> exactly the requested amount (which all callers have calculated in
> a precise way) is made available as tail room.
>
> Signed-off-by: Herbert Xu <[email protected]>
Applied and I'll queue it up for -stable too.
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