From: David S. Miller <davem@davemloft.net>
Date: Sun, 1 Apr 2018 18:08:21 +0000 (-0400)
Subject: Merge branch 'inet-factorize-sk_wmem_alloc-updates'
X-Git-Tag: Ubuntu-5.4-5.4.0-11.14~5681^2~13
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=16c3c91346961fdd733ad232311772795599be7f;p=mirror_ubuntu-focal-kernel.git

Merge branch 'inet-factorize-sk_wmem_alloc-updates'

Eric Dumazet says:

====================
inet: factorize sk_wmem_alloc updates

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.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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16c3c91346961fdd733ad232311772795599be7f