@@ -1356,7 +1356,8 @@ static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
if (!tx_slave) {
/* unbalanced or unassigned, send through primary */
tx_slave = rcu_dereference(bond->curr_active_slave);
- bond_info->unbalanced_load += skb->len;
+ if (bond->params.tlb_dynamic_lb)
+ bond_info->unbalanced_load += skb->len;
}
if (tx_slave && SLAVE_IS_OK(tx_slave)) {
@@ -1369,7 +1370,7 @@ static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
goto out;
}
- if (tx_slave) {
+ if (tx_slave && bond->params.tlb_dynamic_lb) {
_lock_tx_hashtbl(bond);
__tlb_clear_slave(bond, tx_slave, 0);
_unlock_tx_hashtbl(bond);
@@ -1398,11 +1399,20 @@ int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
case ETH_P_IPX: /* In case of IPX, it will falback to L2 hash */
case ETH_P_IPV6:
hash_index = bond_xmit_hash(bond, skb);
- tx_slave = tlb_choose_channel(bond, hash_index & 0xFF, skb->len);
+ if (bond->params.tlb_dynamic_lb) {
+ tx_slave = tlb_choose_channel(bond,
+ hash_index & 0xFF,
+ skb->len);
+ } else {
+ struct list_head *iter;
+ int idx = hash_index % bond->slave_cnt;
+ bond_for_each_slave_rcu(bond, tx_slave, iter)
+ if (--idx < 0)
+ break;
+ }
break;
}
}
-
return bond_do_alb_xmit(skb, bond, tx_slave);
}
@@ -111,6 +111,7 @@ static struct bond_params bonding_defaults;
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
static int packets_per_slave = 1;
static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
+static int tlb_dynamic_lb = 1;
module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
@@ -191,6 +192,9 @@ module_param(lp_interval, uint, 0);
MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
"the bonding driver sends learning packets to "
"each slaves peer switch. The default is 1.");
+module_param(tlb_dynamic_lb, int, 0644);
+MODULE_PARM_DESC(tlb_dynamic_lb, "Enable periodic flow balancing. "
+ "The default is 1.");
/*----------------------------- Global variables ----------------------------*/
@@ -3046,7 +3050,7 @@ static void bond_work_init_all(struct bonding *bond)
{
INIT_DELAYED_WORK(&bond->mcast_work,
bond_resend_igmp_join_requests_delayed);
- if (bond_is_lb(bond))
+ if (bond_is_lb(bond) && bond->params.tlb_dynamic_lb)
INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
@@ -3060,7 +3064,7 @@ static void bond_work_cancel_all(struct bonding *bond)
{
cancel_delayed_work_sync(&bond->mii_work);
cancel_delayed_work_sync(&bond->arp_work);
- if (bond_is_lb(bond))
+ if (bond_is_lb(bond) && bond->params.tlb_dynamic_lb)
cancel_delayed_work_sync(&bond->alb_work);
cancel_delayed_work_sync(&bond->ad_work);
cancel_delayed_work_sync(&bond->mcast_work);
@@ -3098,7 +3102,8 @@ static int bond_open(struct net_device *bond_dev)
*/
if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
return -ENOMEM;
- queue_delayed_work(bond->wq, &bond->alb_work, 0);
+ if (bond->params.tlb_dynamic_lb)
+ queue_delayed_work(bond->wq, &bond->alb_work, 0);
}
if (bond->params.miimon) /* link check interval, in milliseconds. */
@@ -4285,6 +4290,22 @@ static int bond_check_params(struct bond_params *params)
lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
}
+ if (!tlb_dynamic_lb) {
+ if (bond_mode == BOND_MODE_TLB)
+ pr_notice("Dynamic-lb is disabled.\n");
+ else {
+ pr_warn("Disabling dynamic-lb is unsupported"
+ " in this mode, force enabling "
+ "dynamic-lb\n");
+ /*
+ * IMPORTANT: Set it to "1" here so that we
+ * dont have to worry about validating mode
+ * before checking value of tlb_dynamic_lb
+ */
+ tlb_dynamic_lb = 1;
+ }
+ }
+
/* fill params struct with the proper values */
params->mode = bond_mode;
params->xmit_policy = xmit_hashtype;
@@ -4306,6 +4327,7 @@ static int bond_check_params(struct bond_params *params)
params->min_links = min_links;
params->lp_interval = lp_interval;
params->packets_per_slave = packets_per_slave;
+ params->tlb_dynamic_lb = tlb_dynamic_lb;
if (packets_per_slave > 0) {
params->reciprocal_packets_per_slave =
reciprocal_value(packets_per_slave);
@@ -70,6 +70,8 @@ static int bond_option_mode_set(struct bonding *bond,
const struct bond_opt_value *newval);
static int bond_option_slaves_set(struct bonding *bond,
const struct bond_opt_value *newval);
+static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
+ const struct bond_opt_value *newval);
static const struct bond_opt_value bond_mode_tbl[] = {
@@ -179,6 +181,12 @@ static const struct bond_opt_value bond_lp_interval_tbl[] = {
{ NULL, -1, 0},
};
+static const struct bond_opt_value bond_tlb_dynamic_lb_tbl[] = {
+ { "off", 0, 0},
+ { "on", 1, BOND_VALFLAG_DEFAULT},
+ { NULL, -1, 0}
+};
+
static const struct bond_option bond_opts[] = {
[BOND_OPT_MODE] = {
.id = BOND_OPT_MODE,
@@ -364,6 +372,14 @@ static const struct bond_option bond_opts[] = {
.flags = BOND_OPTFLAG_RAWVAL,
.set = bond_option_slaves_set
},
+ [BOND_OPT_TLB_DYNAMIC_LB] = {
+ .id = BOND_OPT_TLB_DYNAMIC_LB,
+ .name = "dynamic_lb",
+ .desc = "Enable dynamic flow shuffling",
+ .unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB)),
+ .values = bond_tlb_dynamic_lb_tbl,
+ .set = bond_option_tlb_dynamic_lb_set,
+ },
{ }
};
@@ -1337,3 +1353,18 @@ err_no_cmd:
ret = -EPERM;
goto out;
}
+
+static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
+ const struct bond_opt_value *newval)
+{
+ int ret = 0;
+
+ if (bond->dev->flags & IFF_UP) {
+ pr_err("%s: Cannot change dynamic-lb - interface up.\n",
+ bond->dev->name);
+ ret = -EPERM;
+ } else
+ bond->params.tlb_dynamic_lb = newval->value;
+
+ return ret;
+}
@@ -62,6 +62,7 @@ enum {
BOND_OPT_RESEND_IGMP,
BOND_OPT_LP_INTERVAL,
BOND_OPT_SLAVES,
+ BOND_OPT_TLB_DYNAMIC_LB,
BOND_OPT_LAST
};
@@ -1039,6 +1039,34 @@ static ssize_t bonding_store_lp_interval(struct device *d,
static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
bonding_show_lp_interval, bonding_store_lp_interval);
+static ssize_t bonding_show_tlb_dynamic_lb(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct bonding *bond = to_bond(d);
+ return sprintf(buf, "%d\n", bond->params.tlb_dynamic_lb);
+}
+
+static ssize_t bonding_store_tlb_dynamic_lb(struct device *d,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct bonding *bond = to_bond(d);
+ int ret;
+
+ ret = bond_opt_tryset_rtnl(bond, BOND_OPT_TLB_DYNAMIC_LB,
+ (char *)buf);
+ if (!ret)
+ ret = count;
+
+ return ret;
+}
+
+static DEVICE_ATTR(tlb_dynamic_lb, S_IRUGO | S_IWUSR,
+ bonding_show_tlb_dynamic_lb,
+ bonding_store_tlb_dynamic_lb);
+
static ssize_t bonding_show_packets_per_slave(struct device *d,
struct device_attribute *attr,
char *buf)
@@ -1099,6 +1127,7 @@ static struct attribute *per_bond_attrs[] = {
&dev_attr_min_links.attr,
&dev_attr_lp_interval.attr,
&dev_attr_packets_per_slave.attr,
+ &dev_attr_tlb_dynamic_lb.attr,
NULL,
};
@@ -174,6 +174,7 @@ struct bond_params {
int resend_igmp;
int lp_interval;
int packets_per_slave;
+ int tlb_dynamic_lb;
struct reciprocal_value reciprocal_packets_per_slave;
};
The aggresive load balancing causes packet re-ordering as active flows are moved from a slave to another within the group. Sometime this aggresive lb is not necessary if the preference is for less re-ordering. This module parameter if used with value "0" disables this dynamic flow shuffling minimizing packet re-ordering. Of course the side effect is that it has to live with the static load balancing that the hashing distribution provides. This impact is less severe if the correct xmit-hashing-policy is used for the tlb setup. The default value of the parameter is set to "1" mimicing the earlier behavior. Ran the netperf test with 200 stream for 1 min between two hosts with 4x1G trunk (xmit-lb mode with xmit-policy L3+4) before and after these changes. Following was the command used for those 200 instances - netperf -t TCP_RR -l 60 -s 5 -H <host> -- -r81920,81920 Transactions per second: Before change: 1,367.11 After change: 1,470.65 Signed-off-by: Mahesh Bandewar <maheshb@google.com> --- v2: [Trivial] Commit log update with the proper workload and perf numbers. drivers/net/bonding/bond_alb.c | 18 ++++++++++++++---- drivers/net/bonding/bond_main.c | 28 +++++++++++++++++++++++++--- drivers/net/bonding/bond_options.c | 31 +++++++++++++++++++++++++++++++ drivers/net/bonding/bond_options.h | 1 + drivers/net/bonding/bond_sysfs.c | 29 +++++++++++++++++++++++++++++ drivers/net/bonding/bonding.h | 1 + 6 files changed, 101 insertions(+), 7 deletions(-)