Hello:
This patch was applied to netdev/net-next.git (refs/heads/master):
On Tue, 26 Jan 2021 18:39:39 +0100 you wrote:
> The current layout of net_device is not optimal for cacheline usage.
>
> The member adj_list.lower linked list is split between cacheline 2 and 3.
> The ifindex is placed together with stats (struct net_device_stats),
> although most modern drivers don't update this stats member.
>
> The members netdev_ops, mtu and hard_header_len are placed on three
> different cachelines. These members are accessed for XDP redirect into
> devmap, which were noticeably with perf tool. When not using the map
> redirect variant (like TC-BPF does), then ifindex is also used, which is
> placed on a separate fourth cacheline. These members are also accessed
> during forwarding with regular network stack. The members priv_flags and
> flags are on fast-path for network stack transmit path in __dev_queue_xmit
> (currently located together with mtu cacheline).
>
> [...]
Here is the summary with links:
- [net-next,V1] net: adjust net_device layout for cacheline usage
https://git.kernel.org/netdev/net-next/c/28af22c6c8df
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
