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([37.17.237.224]) by smtp.gmail.com with ESMTPSA id q20sm4575wrf.45.2021.06.09.06.55.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jun 2021 06:55:54 -0700 (PDT) From: Jussi Maki To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, daniel@iogearbox.net, j.vosburgh@gmail.com, andy@greyhouse.net, vfalico@gmail.com, andrii@kernel.org, Jussi Maki Subject: [PATCH bpf-next 2/3] net: bonding: Use per-cpu rr_tx_counter Date: Wed, 9 Jun 2021 13:55:36 +0000 Message-Id: <20210609135537.1460244-3-joamaki@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210609135537.1460244-1-joamaki@gmail.com> References: <20210609135537.1460244-1-joamaki@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The round-robin rr_tx_counter was shared across CPUs leading to significant cache trashing at high packet rates. This patch switches the round-robin mechanism to use a per-cpu counter to decide the destination device. On a 100Gbit 64 byte packet test this reduces the CPU load from 50% to 10% on the test system. Signed-off-by: Jussi Maki Acked-by: Jay Vosburgh --- drivers/net/bonding/bond_main.c | 18 +++++++++++++++--- include/net/bonding.h | 2 +- 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 38eea7e096f3..917dd2cdcbf4 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4314,16 +4314,16 @@ static u32 bond_rr_gen_slave_id(struct bonding *bond) slave_id = prandom_u32(); break; case 1: - slave_id = bond->rr_tx_counter; + slave_id = this_cpu_inc_return(*bond->rr_tx_counter); break; default: reciprocal_packets_per_slave = bond->params.reciprocal_packets_per_slave; - slave_id = reciprocal_divide(bond->rr_tx_counter, + slave_id = this_cpu_inc_return(*bond->rr_tx_counter); + slave_id = reciprocal_divide(slave_id, reciprocal_packets_per_slave); break; } - bond->rr_tx_counter++; return slave_id; } @@ -5278,6 +5278,9 @@ static void bond_uninit(struct net_device *bond_dev) list_del(&bond->bond_list); + if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) + free_percpu(bond->rr_tx_counter); + bond_debug_unregister(bond); } @@ -5681,6 +5684,15 @@ static int bond_init(struct net_device *bond_dev) if (!bond->wq) return -ENOMEM; + if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN) { + bond->rr_tx_counter = alloc_percpu(u32); + if (!bond->rr_tx_counter) { + destroy_workqueue(bond->wq); + bond->wq = NULL; + return -ENOMEM; + } + } + spin_lock_init(&bond->stats_lock); netdev_lockdep_set_classes(bond_dev); diff --git a/include/net/bonding.h b/include/net/bonding.h index 34acb81b4234..8de8180f1be8 100644 --- a/include/net/bonding.h +++ b/include/net/bonding.h @@ -232,7 +232,7 @@ struct bonding { char proc_file_name[IFNAMSIZ]; #endif /* CONFIG_PROC_FS */ struct list_head bond_list; - u32 rr_tx_counter; + u32 __percpu *rr_tx_counter; struct ad_bond_info ad_info; struct alb_bond_info alb_info; struct bond_params params;