From 41ed0a00ffcd903ece4304a4a65d95706115ffcb Mon Sep 17 00:00:00 2001 From: "Dwip N. Banerjee" Date: Wed, 18 Nov 2020 19:12:25 -0600 Subject: 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 Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/ibm/ibmvnic.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 96df6d8fa277..9fe43ab0496d 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -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)) { -- cgit v1.2.3