Commit 41ed0a00 authored Nov 18, 2020 by Dwip N. Banerjee Committed by Jakub Kicinski Nov 20, 2020

ibmvnic: Do not replenish RX buffers after every polling loop

Reduce the amount of time spent replenishing RX buffers by only doing
so once available buffers has fallen under a certain threshold, in this
case half of the total number of buffers, or if the polling loop exits
before the packets processed is less than its budget. Non-exhaustion of
NAPI budget implies lower incoming packet pressure, allowing the leeway
to refill the buffers in preparation for any impending burst.

Signed-off-by: Dwip N. Banerjee <dnbanerg@us.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent e552aa31

drivers/net/ethernet/ibm/ibmvnic.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -2537,7 +2537,10 @@ restart_poll:
		frames_processed++;
		}

		if (adapter->state != VNIC_CLOSING)
		if (adapter->state != VNIC_CLOSING &&
		((atomic_read(&adapter->rx_pool[scrq_num].available) <
		adapter->req_rx_add_entries_per_subcrq / 2) \|\|
		frames_processed < budget))
		replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
		if (frames_processed < budget) {
		if (napi_complete_done(napi, frames_processed)) {

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