Patch "ath10k: fix throughput regression in multi client mode" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

ath10k: fix throughput regression in multi client mode

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ath10k-fix-throughput-regression-in-multi-client-mode.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Rajkumar Manoharan <[email protected]>
Date: Fri, 2 Sep 2016 19:46:10 +0300
Subject: ath10k: fix throughput regression in multi client mode

From: Rajkumar Manoharan <[email protected]>

commit 18f53fe0f30331e826b075709ed7b26b9283235e upstream.

commit 7a0adc83f34d ("ath10k: improve tx scheduling") is causing severe throughput drop in multi client mode. This issue is originally reported in veriwave setup with 50 clients with TCP downlink traffic. While increasing number of clients, the average throughput drops gradually. With 50 clients, the combined peak throughput is decreased to 98 Mbps whereas reverting given commit restored it to 550 Mbps.

Processing txqs for every tx completion is causing overhead. Ideally for management frame tx completion, pending txqs processing can be avoided. The change partly reverts the commit "ath10k: improve tx scheduling". Processing pending txqs after all skbs tx completion will yeild enough room to burst tx frames.

---
 drivers/net/wireless/ath/ath10k/htt_rx.c |    2 ++
 drivers/net/wireless/ath/ath10k/txrx.c   |    2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

@@ -2394,6 +2394,8 @@ static void ath10k_htt_txrx_compl_task(u
 	skb_queue_splice_init(&htt->rx_in_ord_compl_q, &rx_ind_q);
 	spin_unlock_irqrestore(&htt->rx_in_ord_compl_q.lock, flags);
 
+	ath10k_mac_tx_push_pending(ar);
+
 	spin_lock_irqsave(&htt->tx_fetch_ind_q.lock, flags);
 	skb_queue_splice_init(&htt->tx_fetch_ind_q, &tx_ind_q);
 	spin_unlock_irqrestore(&htt->tx_fetch_ind_q.lock, flags);

@@ -119,8 +119,6 @@ int ath10k_txrx_tx_unref(struct ath10k_h
 	ieee80211_tx_status(htt->ar->hw, msdu);
 	/* we do not own the msdu anymore */
 
-	ath10k_mac_tx_push_pending(ar);
-
 	return 0;
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/ath10k-fix-throughput-regression-in-multi-client-mode.patch