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wil6210: Tx performance monitoring 

For performance monitoring, trace time intervals when Tx vring
is idle/not idle. Use CPU cycle counter for this, because jiffies is
too rough, and other precise time measurement methods involve
overhead while get_cycles() should be fast.
This used to provide some estimation for percentage when Tx vring
was idle, i.e. when hardware is under-utilized.
Estimation is not precise because of many reasons - CPU frequency scaling,
grt_cycles() may be per core etc. But still, it is good estimation

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vladimir Kondratiev 2014-06-16 19:37:05 +03:00 committed by John W. Linville
parent 67c3e1b41e
commit 7c0acf868d
3 changed files with 23 additions and 4 deletions
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16
drivers/net/wireless/ath/wil6210/debugfs.c
View File

@ -69,6 +69,8 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++) {
struct vring *vring = &(wil->vring_tx[i]);
struct vring_tx_data *txdata = &wil->vring_tx_data[i];
if (vring->va) {
int cid = wil->vring2cid_tid[i][0];
int tid = wil->vring2cid_tid[i][1];
@ -78,10 +80,20 @@ static int wil_vring_debugfs_show(struct seq_file *s, void *data)
% vring->size;
int avail = vring->size - used - 1;
char name[10];
/* performance monitoring */
cycles_t now = get_cycles();
cycles_t idle = txdata->idle;
cycles_t total = now - txdata->begin;
txdata->begin = now;
txdata->idle = 0ULL;
snprintf(name, sizeof(name), "tx_%2d", i);
seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d]\n",
wil->sta[cid].addr, cid, tid, used, avail);
seq_printf(s, "\n%pM CID %d TID %d [%3d|%3d] idle %3d%%\n",
wil->sta[cid].addr, cid, tid, used, avail,
(int)((idle*100)/total));
wil_print_vring(s, wil, name, vring, '_', 'H');
}
}

8
drivers/net/wireless/ath/wil6210/txrx.c
View File

@ -881,6 +881,7 @@ static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
int nr_frags = skb_shinfo(skb)->nr_frags;
uint f = 0;
int vring_index = vring - wil->vring_tx;
struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
uint i = swhead;
dma_addr_t pa;
@ -953,6 +954,9 @@ static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
(const void *)d, sizeof(*d), false);
if (wil_vring_is_empty(vring)) /* performance monitoring */
txdata->idle += get_cycles() - txdata->last_idle;
/* advance swhead */
wil_vring_advance_head(vring, nr_frags + 1);
wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
@ -1133,8 +1137,10 @@ int wil_tx_complete(struct wil6210_priv *wil, int ringid)
}
}
if (wil_vring_is_empty(vring))
if (wil_vring_is_empty(vring)) { /* performance monitoring */
wil_dbg_txrx(wil, "Ring[%2d] empty\n", ringid);
txdata->last_idle = get_cycles();
}
if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring))
netif_tx_wake_all_queues(wil_to_ndev(wil));

3
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -20,6 +20,7 @@
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <net/cfg80211.h>
#include <linux/timex.h>
#define WIL_NAME "wil6210"
@ -251,7 +252,7 @@ struct vring {
*/
struct vring_tx_data {
int enabled;
cycles_t idle, last_idle, begin;
};
enum { /* for wil6210_priv.status */