linux-kernel - [PATCH net-next] net: pin system percpu page

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Date: Mon, 25 Mar 2024 17:06:35 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Toke Høiland-Jørgensen <toke@...hat.com>,
	nex.sw.ncis.osdt.itp.upstreaming@...el.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] net: pin system percpu page_pools to the corresponding NUMA nodes

System page_pools are percpu and one instance can be used only on
one CPU.
%NUMA_NO_NODE is fine for allocating pages, as the PP core always
allocates local pages in this case. But for the struct &page_pool
itself, this node ID means they are allocated on the boot CPU,
which may belong to a different node than the target CPU.
Pin system page_pools to the corresponding nodes when creating,
so that all the allocated data will always be local. Use
cpu_to_mem() to account memless nodes.
Nodes != 0 win some Kpps when testing with xdp-trafficgen.

Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 9a67003e49db..fefa484d715a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11712,7 +11712,7 @@ static int net_page_pool_create(int cpuid)
 	struct page_pool_params page_pool_params = {
 		.pool_size = SYSTEM_PERCPU_PAGE_POOL_SIZE,
 		.flags = PP_FLAG_SYSTEM_POOL,
-		.nid = NUMA_NO_NODE,
+		.nid = cpu_to_mem(cpuid),
 	};
 	struct page_pool *pp_ptr;

-- 
2.44.0