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[2/2] brcmfmac: Set pacing shift before transmitting skb to bus

Message ID 20200622020721.498-3-wright.feng@cypress.com
State New
Headers show
Series brcmfmac: Stability and throughput changes | expand

Commit Message

Wright Feng June 22, 2020, 2:07 a.m. UTC 
Linux 3.6 introduces TSQ which has a per socket threshold for TCP Tx
packet to reduce latency. In flow control mode, host driver enqueues skb
in hanger and TCP doesn't push new skb frees until host frees the skb when
receiving fwstatus event. So set pacing shift 8 to send them as a single
large aggregate frame to the bus layer.

43455 TX TCP throughput in FC mode 2 on Linux 5.4.18
sk_pacing_shift : Throughput
10: 190 Mbps
 9: 216 Mbps
 8: 233 Mbps (Max throughput)
 7: 233 Mpbs

Signed-off-by: Wright Feng <wright.feng@cypress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index c88655acc78c..f89010a81ffb 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -352,6 +352,9 @@  static netdev_tx_t brcmf_netdev_start_xmit(struct sk_buff *skb,
 	if ((skb->priority == 0) || (skb->priority > 7))
 		skb->priority = cfg80211_classify8021d(skb, NULL);
 
+	/* set pacing shift for packet aggregation */
+	sk_pacing_shift_update(skb->sk, 8);
+
 	ret = brcmf_proto_tx_queue_data(drvr, ifp->ifidx, skb);
 	if (ret < 0)
 		brcmf_txfinalize(ifp, skb, false);