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Date: Thu, 13 May 2021 19:25:54 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Matteo Croce <mcroce@...ux.microsoft.com>
Cc: netdev@...r.kernel.org, linux-mm@...ck.org,
Ayush Sawal <ayush.sawal@...lsio.com>,
Vinay Kumar Yadav <vinay.yadav@...lsio.com>,
Rohit Maheshwari <rohitm@...lsio.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Marcin Wojtas <mw@...ihalf.com>,
Mirko Lindner <mlindner@...vell.com>,
Stephen Hemminger <stephen@...workplumber.org>,
Tariq Toukan <tariqt@...dia.com>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
Boris Pismenny <borisp@...dia.com>,
Arnd Bergmann <arnd@...db.de>,
Andrew Morton <akpm@...ux-foundation.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>, Yu Zhao <yuzhao@...gle.com>,
Will Deacon <will@...nel.org>,
Fenghua Yu <fenghua.yu@...el.com>,
Roman Gushchin <guro@...com>, Hugh Dickins <hughd@...gle.com>,
Peter Xu <peterx@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
Jonathan Lemon <jonathan.lemon@...il.com>,
Alexander Lobakin <alobakin@...me>,
Cong Wang <cong.wang@...edance.com>, wenxu <wenxu@...oud.cn>,
Kevin Hao <haokexin@...il.com>,
Jakub Sitnicki <jakub@...udflare.com>,
Marco Elver <elver@...gle.com>,
Willem de Bruijn <willemb@...gle.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Yunsheng Lin <linyunsheng@...wei.com>,
Guillaume Nault <gnault@...hat.com>,
linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
bpf@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
Eric Dumazet <edumazet@...gle.com>,
David Ahern <dsahern@...il.com>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Saeed Mahameed <saeedm@...dia.com>,
Andrew Lunn <andrew@...n.ch>, Paolo Abeni <pabeni@...hat.com>,
Sven Auhagen <sven.auhagen@...eatech.de>
Subject: Re: [PATCH net-next v5 5/5] mvneta: recycle buffers
On Thu, May 13, 2021 at 06:58:46PM +0200, Matteo Croce wrote:
> From: Matteo Croce <mcroce@...rosoft.com>
>
> Use the new recycling API for page_pool.
> In a drop rate test, the packet rate increased di 10%,
Typo - "by" ?
> from 269 Kpps to 296 Kpps.
>
> perf top on a stock system shows:
>
> Overhead Shared Object Symbol
> 21.78% [kernel] [k] __pi___inval_dcache_area
> 21.66% [mvneta] [k] mvneta_rx_swbm
> 7.00% [kernel] [k] kmem_cache_alloc
> 6.05% [kernel] [k] eth_type_trans
> 4.44% [kernel] [k] kmem_cache_free.part.0
> 3.80% [kernel] [k] __netif_receive_skb_core
> 3.68% [kernel] [k] dev_gro_receive
> 3.65% [kernel] [k] get_page_from_freelist
> 3.43% [kernel] [k] page_pool_release_page
> 3.35% [kernel] [k] free_unref_page
>
> And this is the same output with recycling enabled:
>
> Overhead Shared Object Symbol
> 24.10% [kernel] [k] __pi___inval_dcache_area
> 23.02% [mvneta] [k] mvneta_rx_swbm
> 7.19% [kernel] [k] kmem_cache_alloc
> 6.50% [kernel] [k] eth_type_trans
> 4.93% [kernel] [k] __netif_receive_skb_core
> 4.77% [kernel] [k] kmem_cache_free.part.0
> 3.93% [kernel] [k] dev_gro_receive
> 3.03% [kernel] [k] build_skb
> 2.91% [kernel] [k] page_pool_put_page
> 2.85% [kernel] [k] __xdp_return
>
> The test was done with mausezahn on the TX side with 64 byte raw
> ethernet frames.
>
> Signed-off-by: Matteo Croce <mcroce@...rosoft.com>
Other than the typo, I have no objection to the patch.
Acked-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ---
> drivers/net/ethernet/marvell/mvneta.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index 7d5cd9bc6c99..6d2f8dce4900 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -2320,7 +2320,7 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp,
> }
>
> static struct sk_buff *
> -mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> +mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool,
> struct xdp_buff *xdp, u32 desc_status)
> {
> struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
> @@ -2331,7 +2331,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> if (!skb)
> return ERR_PTR(-ENOMEM);
>
> - page_pool_release_page(rxq->page_pool, virt_to_page(xdp->data));
> + skb_mark_for_recycle(skb, virt_to_page(xdp->data), pool);
>
> skb_reserve(skb, xdp->data - xdp->data_hard_start);
> skb_put(skb, xdp->data_end - xdp->data);
> @@ -2343,7 +2343,10 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
> skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
> skb_frag_page(frag), skb_frag_off(frag),
> skb_frag_size(frag), PAGE_SIZE);
> - page_pool_release_page(rxq->page_pool, skb_frag_page(frag));
> + /* We don't need to reset pp_recycle here. It's already set, so
> + * just mark fragments for recycling.
> + */
> + page_pool_store_mem_info(skb_frag_page(frag), pool);
> }
>
> return skb;
> @@ -2425,7 +2428,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
> mvneta_run_xdp(pp, rxq, xdp_prog, &xdp_buf, frame_sz, &ps))
> goto next;
>
> - skb = mvneta_swbm_build_skb(pp, rxq, &xdp_buf, desc_status);
> + skb = mvneta_swbm_build_skb(pp, pp, &xdp_buf, desc_status);
> if (IS_ERR(skb)) {
> struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
>
> --
> 2.31.1
>
>
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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