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Date: Sat, 2 Apr 2011 22:09:54 +0800 From: Weiping Pan(潘卫平) <panweiping3@...il.com> To: unlisted-recipients:; (no To-header on input) Cc: =?UTF-8?q?Weiping=20Pan (=E6=BD=98=E5=8D=AB=E5=B9=B3) ?= <panweiping3@...il.com>, Jay Vosburgh <fubar@...ibm.com> (supporter:BONDING DRIVER), Andy Gospodarek <andy@...yhouse.net> (supporter:BONDING DRIVER), netdev@...r.kernel.org (open list:BONDING DRIVER), linux-kernel@...r.kernel.org (open list) Subject: [PATCH] bonding-tlb: better balance when choosing slaves tlb_get_least_loaded_slave() always chooses slave from bonding->first_slave, that gives the beginnig slaves more chances to be used. Let tlb_get_least_loaded_slave() chooses slave from a random positon in the slave list, make all slaves transmit packets more balanced. Signed-off-by: Weiping Pan(潘卫平) <panweiping3@...il.com> --- drivers/net/bonding/bond_alb.c | 17 +++++++++++++++-- 1 files changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index 9bc5de3..9fa64b0 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -36,6 +36,7 @@ #include <linux/if_bonding.h> #include <linux/if_vlan.h> #include <linux/in.h> +#include <linux/random.h> #include <net/ipx.h> #include <net/arp.h> #include <net/ipv6.h> @@ -206,15 +207,27 @@ static long long compute_gap(struct slave *slave) /* Caller must hold bond lock for read */ static struct slave *tlb_get_least_loaded_slave(struct bonding *bond) { - struct slave *slave, *least_loaded; + struct slave *slave, *least_loaded, *start_slave; long long max_gap; int i; + u8 n; least_loaded = NULL; + start_slave = bond->first_slave; max_gap = LLONG_MIN; + + get_random_bytes(&n, 1); + + if (bond->slave_cnt == 0) + return NULL; + n = n % bond->slave_cnt; + + for (i=0; i<n; ++i) { + start_slave = start_slave->next; + } /* Find the slave with the largest gap */ - bond_for_each_slave(bond, slave, i) { + bond_for_each_slave_from(bond, slave, i, start_slave) { if (SLAVE_IS_OK(slave)) { long long gap = compute_gap(slave); -- 1.7.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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