Adam Li fe1e83811c net: make SK_MEMORY_PCPU_RESERV tunable ... [ Upstream commit 12a686c2e7 ] This patch adds /proc/sys/net/core/mem_pcpu_rsv sysctl file, to make SK_MEMORY_PCPU_RESERV tunable. Commit 3cd3399dd7 ("net: implement per-cpu reserves for memory_allocated") introduced per-cpu forward alloc cache: "Implement a per-cpu cache of +1/-1 MB, to reduce number of changes to sk->sk_prot->memory_allocated, which would otherwise be cause of false sharing." sk_prot->memory_allocated points to global atomic variable: atomic_long_t tcp_memory_allocated ____cacheline_aligned_in_smp; If increasing the per-cpu cache size from 1MB to e.g. 16MB, changes to sk->sk_prot->memory_allocated can be further reduced. Performance may be improved on system with many cores. Signed-off-by: Adam Li <adamli@os.amperecomputing.com> Reviewed-by: Christoph Lameter (Ampere) <cl@linux.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of: 3584718cf2 ("net: fix sk_memory_allocated_{add|sub} vs softirqs") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-05-02 16:32:36 +02:00
..
abi.rst	docs: admin-guide: sysctl: avoid using ReST :doc:foo markup	2021-06-17 13:24:36 -06:00
fs.rst	docs: sysctl/fs: re-order, prettify	2022-10-19 16:42:09 -06:00
index.rst
kernel.rst	io_uring-6.6-2023-09-08	2023-09-08 21:32:28 -07:00
net.rst	net: make SK_MEMORY_PCPU_RESERV tunable	2024-05-02 16:32:36 +02:00
sunrpc.rst
user.rst	time/namespace: Add max_time_namespaces ucount	2020-04-07 12:37:21 +02:00
vm.rst	Documentation: admin-guide: correct spelling	2023-02-02 11:04:42 -07:00