netdev - Re: [PATCH v2 bpf-next 0/6] xsk: struct diet and cleanups

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Message-ID: <CAJ8uoz1giCLozes9kYpzwns1Vb+sLfV=7t4jXvpGZgDD26-sdA@mail.gmail.com>
Date: Tue, 8 Oct 2024 12:31:28 +0200
From: Magnus Karlsson <magnus.karlsson@...il.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net, 
	andrii@...nel.org, netdev@...r.kernel.org, magnus.karlsson@...el.com, 
	bjorn@...nel.org, vadfed@...a.com
Subject: Re: [PATCH v2 bpf-next 0/6] xsk: struct diet and cleanups

On Mon, 7 Oct 2024 at 14:27, Maciej Fijalkowski
<maciej.fijalkowski@...el.com> wrote:
>
> Hi all,
>
> this modest work brings back size of xdp_buff_xsk back to two cache
> lines which in turn improves performance. Interestingly I was able to
> observe on ice with HW rings sized to 512 around 12% better performance
> when running xdpsock in l2fwd scenario. First three patches are behind
> this. Other setups were not that impressive, I believe results may vary
> based on the underlying CPU. Bottom line is that shrinking this struct
> takes off a bit of work from CPU's shoulders.
>
> Other three patches are rather cleanups.
>
> Thanks,
> Maciej

Thanks for these improvements Maciej.

For the series:
Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

> v1->v2:
> * fix build issues on patch 1 (Daniel, CI)
> * be smarter about xsk_buff_pool layout in patch 4 (Vadim)
>
> Maciej Fijalkowski (6):
>   xsk: get rid of xdp_buff_xsk::xskb_list_node
>   xsk: s/free_list_node/list_node
>   xsk: get rid of xdp_buff_xsk::orig_addr
>   xsk: carry a copy of xdp_zc_max_segs within xsk_buff_pool
>   xsk: wrap duplicated code to function
>   xsk: use xsk_buff_pool directly for cq functions
>
>  include/net/xdp_sock_drv.h  | 14 +++++-----
>  include/net/xsk_buff_pool.h | 23 +++++++++-------
>  net/xdp/xsk.c               | 38 +++++++++++++-------------
>  net/xdp/xsk_buff_pool.c     | 54 ++++++++++++++++++++-----------------
>  net/xdp/xsk_queue.h         |  2 +-
>  5 files changed, 69 insertions(+), 62 deletions(-)
>
> --
> 2.34.1
>
>