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ibmvnic: Do not replenish RX buffers after every polling loop

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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>
This commit is contained in:
Dwip N. Banerjee
2020-11-18 19:12:25 -06:00
committed by Jakub Kicinski
parent e552aa313b
commit 41ed0a00ff
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/ibm/ibmvnic.c
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@@ -2537,7 +2537,10 @@ restart_poll:
frames_processed++; 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]); replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
if (frames_processed < budget) { if (frames_processed < budget) {
if (napi_complete_done(napi, frames_processed)) { if (napi_complete_done(napi, frames_processed)) {