From: Eric Dumazet <eduma...@google.com> Date: Sat, 31 Mar 2018 13:16:24 -0700
> While testing my inet defrag changes, I found that senders > could spend ~20% of cpu cycles in skb_set_owner_w() updating > sk->sk_wmem_alloc for every fragment they cook, competing > with TX completion of prior skbs possibly happening on another cpus. > > One solution to this problem is to use alloc_skb() instead > of sock_wmalloc() and manually perform a single sk_wmem_alloc change. > > This greatly increases speed for applications sending big UDP datagrams. Looks good, series applied, thanks.
