Implement a recv budget so that in cases of high traffic we still allow other taskets to get processed. Without this, we can encounter a host of issues during high wireless traffic reception depending on system load including rcu stall's detected (ARM), soft lockups, failure to service critical tasks such as watchdog resets, and triggering of the tx stuck tasklet. The same thing was proposed previously by Ben: http://www.spinics.net/lists/linux-wireless/msg112891.html The only difference here is that I make sure only processed packets are counted in the budget by checking at the end of the rx loop. Signed-off-by: Tim Harvey <tharvey@xxxxxxxxxxxxx> --- drivers/net/wireless/ath/ath9k/recv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index e77a253..19df969 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -975,6 +975,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) u64 tsf = 0; unsigned long flags; dma_addr_t new_buf_addr; + unsigned int budget = 512; if (edma) dma_type = DMA_BIDIRECTIONAL; @@ -1121,6 +1122,9 @@ requeue: if (!flush) ath9k_hw_rxena(ah); } + + if (!budget--) + break; } while (1); if (!(ah->imask & ATH9K_INT_RXEOL)) { -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
