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ath9k: fix queue depth check for forming new aggregates 

To improve aggregation length, there should not be more than two fully formed
A-MPDU frames in the hardware queue. To ensure this, the code checks the tx
queue length before forming new A-MPDUs. This can reduce the throughput (or
maybe even starve out A-MPDU traffic) when too many non-aggregated frames are
in the queue.
Fix this by keeping track of pending A-MPDU frames (even when they're sent out
as single frames), but exclude rate control probing frames to improve
performance.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-12-17 00:57:00 +01:00 committed by John W. Linville
parent 5c405b5c3e
commit 4b3ba66a47
2 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -189,6 +189,7 @@ struct ath_txq {
struct list_head axq_q;
spinlock_t axq_lock;
u32 axq_depth;
u32 axq_ampdu_depth;
bool stopped;
bool axq_tx_inprogress;
struct list_head axq_acq;

21
drivers/net/wireless/ath/ath9k/xmit.c
View File

@ -838,7 +838,7 @@ static void ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
ath_tx_txqaddbuf(sc, txq, &bf_q);
TX_STAT_INC(txq->axq_qnum, a_aggr);
} while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
} while (txq->axq_ampdu_depth < ATH_AGGR_MIN_QDEPTH &&
status != ATH_AGGR_BAW_CLOSED);
}
@ -999,6 +999,7 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
INIT_LIST_HEAD(&txq->axq_acq);
spin_lock_init(&txq->axq_lock);
txq->axq_depth = 0;
txq->axq_ampdu_depth = 0;
txq->axq_tx_inprogress = false;
sc->tx.txqsetup |= 1<<qnum;
@ -1068,6 +1069,12 @@ int ath_cabq_update(struct ath_softc *sc)
return 0;
}
static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
}
/*
* Drain a given TX queue (could be Beacon or Data)
*
@ -1126,7 +1133,8 @@ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
}
txq->axq_depth--;
if (bf_is_ampdu_not_probing(bf))
txq->axq_ampdu_depth--;
spin_unlock_bh(&txq->axq_lock);
if (bf_isampdu(bf))
@ -1316,6 +1324,8 @@ static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
ath9k_hw_txstart(ah, txq->axq_qnum);
}
txq->axq_depth++;
if (bf_is_ampdu_not_probing(bf))
txq->axq_ampdu_depth++;
}
static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
@ -1336,7 +1346,7 @@ static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
*/
if (!list_empty(&tid->buf_q) || tid->paused ||
!BAW_WITHIN(tid->seq_start, tid->baw_size, fi->seqno) ||
txctl->txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) {
txctl->txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) {
/*
* Add this frame to software queue for scheduling later
* for aggregation.
@ -2040,6 +2050,9 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
txq->axq_tx_inprogress = false;
if (bf_held)
list_del(&bf_held->list);
if (bf_is_ampdu_not_probing(bf))
txq->axq_ampdu_depth--;
spin_unlock_bh(&txq->axq_lock);
if (bf_held)
@ -2168,6 +2181,8 @@ void ath_tx_edma_tasklet(struct ath_softc *sc)
INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
txq->axq_depth--;
txq->axq_tx_inprogress = false;
if (bf_is_ampdu_not_probing(bf))
txq->axq_ampdu_depth--;
spin_unlock_bh(&txq->axq_lock);
txok = !(txs.ts_status & ATH9K_TXERR_MASK);