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net/smc: optimize consumer cursor updates 

The SMC protocol requires to send a separate consumer cursor update,
if it cannot be piggybacked to updates of the producer cursor.
Currently the decision to send a separate consumer cursor update
just considers the amount of data already received by the socket
program. It does not consider the amount of data already arrived, but
not yet consumed by the receiver. Basing the decision on the
difference between already confirmed and already arrived data
(instead of difference between already confirmed and already consumed
data), may lead to a somewhat earlier consumer cursor update send in
fast unidirectional traffic scenarios, and thus to better throughput.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Suggested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2018-06-28 19:05:06 +02:00 committed by David S. Miller
parent 0afff91c6f
commit e82f2e31f5
1 changed files with 10 additions and 2 deletions
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12
net/smc/smc_tx.c
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@ -495,7 +495,8 @@ out:
void smc_tx_consumer_update(struct smc_connection *conn, bool force)
{
union smc_host_cursor cfed, cons;
union smc_host_cursor cfed, cons, prod;
int sender_free = conn->rmb_desc->len;
int to_confirm;
smc_curs_write(&cons,
@ -505,11 +506,18 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force)
smc_curs_read(&conn->rx_curs_confirmed, conn),
conn);
to_confirm = smc_curs_diff(conn->rmb_desc->len, &cfed, &cons);
if (to_confirm > conn->rmbe_update_limit) {
smc_curs_write(&prod,
smc_curs_read(&conn->local_rx_ctrl.prod, conn),
conn);
sender_free = conn->rmb_desc->len -
smc_curs_diff(conn->rmb_desc->len, &prod, &cfed);
}
if (conn->local_rx_ctrl.prod_flags.cons_curs_upd_req ||
force ||
((to_confirm > conn->rmbe_update_limit) &&
((to_confirm > (conn->rmb_desc->len / 2)) ||
((sender_free <= (conn->rmb_desc->len / 2)) ||
conn->local_rx_ctrl.prod_flags.write_blocked))) {
if ((smc_cdc_get_slot_and_msg_send(conn) < 0) &&
conn->alert_token_local) { /* connection healthy */