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 different FC modes on Linux 5.4.18 sk_pacing_shift : Throughput (fcmode=0) 10: 245 Mbps 9: 245 Mbps 8: 246 Mbps 7: 246 Mbps sk_pacing_shift : Throughput (fcmode=1) 10: 182 Mbps 9: 197 Mbps 8: 206 Mbps 7: 207 Mbps sk_pacing_shift : Throughput (fcmode=2) 10: 180 Mbps 9: 197 Mbps 8: 206 Mbps 7: 207 Mbps Signed-off-by: Wright Feng <wright.feng@xxxxxxxxxxx> Signed-off-by: Chi-hsien Lin <chi-hsien.lin@xxxxxxxxxxx> --- v2: - Add more testing results drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c | 3 +++ 1 file changed, 3 insertions(+) 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); -- 2.25.0
