54 lines
2.2 KiB
Diff
54 lines
2.2 KiB
Diff
Polling TX statuses too frequently has two negative effects. First is
|
|
randomly peek CPU usage, causing overall system functioning delays.
|
|
Second bad effect is that device is not able to fill TX statuses in
|
|
H/W register on some workloads and we get lot of timeouts like below:
|
|
|
|
ieee80211 phy4: rt2800usb_entry_txstatus_timeout: Warning - TX status timeout for entry 7 in queue 2
|
|
ieee80211 phy4: rt2800usb_entry_txstatus_timeout: Warning - TX status timeout for entry 7 in queue 2
|
|
ieee80211 phy4: rt2800usb_txdone: Warning - Got TX status for an empty queue 2, dropping
|
|
|
|
This not only cause flood of messages in dmesg, but also bad throughput,
|
|
since rate scaling algorithm can not work optimally.
|
|
|
|
In the future, we should probably make polling interval be adjusted
|
|
automatically, but for now just increase values, this make mentioned
|
|
problems gone.
|
|
|
|
Resolve:
|
|
https://bugzilla.kernel.org/show_bug.cgi?id=62781
|
|
|
|
Cc: stable@vger.kernel.org
|
|
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
|
|
---
|
|
drivers/net/wireless/rt2x00/rt2800usb.c | 8 ++++----
|
|
1 file changed, 4 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
|
|
index 96677ce5..e095e61 100644
|
|
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
|
|
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
|
|
@@ -176,8 +176,8 @@ static bool rt2800usb_tx_sta_fifo_read_completed(struct rt2x00_dev *rt2x00dev,
|
|
queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
|
|
|
|
if (rt2800usb_txstatus_pending(rt2x00dev)) {
|
|
- /* Read register after 250 us */
|
|
- hrtimer_start(&rt2x00dev->txstatus_timer, ktime_set(0, 250000),
|
|
+ /* Read register after 1 ms */
|
|
+ hrtimer_start(&rt2x00dev->txstatus_timer, ktime_set(0, 1000000),
|
|
HRTIMER_MODE_REL);
|
|
return false;
|
|
}
|
|
@@ -202,8 +202,8 @@ static void rt2800usb_async_read_tx_status(struct rt2x00_dev *rt2x00dev)
|
|
if (test_and_set_bit(TX_STATUS_READING, &rt2x00dev->flags))
|
|
return;
|
|
|
|
- /* Read TX_STA_FIFO register after 500 us */
|
|
- hrtimer_start(&rt2x00dev->txstatus_timer, ktime_set(0, 500000),
|
|
+ /* Read TX_STA_FIFO register after 2 ms */
|
|
+ hrtimer_start(&rt2x00dev->txstatus_timer, ktime_set(0, 2000000),
|
|
HRTIMER_MODE_REL);
|
|
}
|
|
|
|
--
|
|
1.8.3.1
|