diff options
| author | Shengzhou Liu <Shengzhou.Liu@freescale.com> | 2013-04-09 08:04:25 (GMT) |
|---|---|---|
| committer | Fleming Andrew-AFLEMING <AFLEMING@freescale.com> | 2013-04-16 15:35:17 (GMT) |
| commit | ba3826a63a89a9efd73c984cc633bca4bdc2434c (patch) | |
| tree | 40ac8e90f8cae588281db800bab852436b5627a0 /drivers | |
| parent | 8cb17e991c16449546ca9b21a5bb0575e5b8c24a (diff) | |
| download | linux-fsl-qoriq-ba3826a63a89a9efd73c984cc633bca4bdc2434c.tar.xz | |
powerpc/dpaa_1588: optimization for 1588 performance
In case of overloading the slaves, the performace will get worse
since there are more and more outdated timestamps accumulated in
Tx buffer, so we introduce a way to remove those older timestamps
between the current matched one and the tail if they are more than
TS_ACCUMULATION_THRESHOLD. In addition, we update the buffer size
to 256 which is enough according to stress tests.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Change-Id: I761dcabf71f27d47627ca835daf28562bfa37319
Reviewed-on: http://git.am.freescale.net:8181/1146
Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Tested-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/freescale/dpa/dpaa_1588.c | 6 | ||||
| -rw-r--r-- | drivers/net/ethernet/freescale/dpa/dpaa_1588.h | 7 |
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/net/ethernet/freescale/dpa/dpaa_1588.c b/drivers/net/ethernet/freescale/dpa/dpaa_1588.c index 8413b1e..89c7f15 100644 --- a/drivers/net/ethernet/freescale/dpa/dpaa_1588.c +++ b/drivers/net/ethernet/freescale/dpa/dpaa_1588.c @@ -147,6 +147,11 @@ static int dpa_ptp_find_and_remove(struct dpa_ptp_circ_buf *ptp_buf, ts->nsec = tmp->ts.nsec; if (idx != tail) { + if (CIRC_CNT(idx, tail, size) > TS_ACCUMULATION_THRESHOLD) { + tail = circ_buf->tail = + (idx - TS_ACCUMULATION_THRESHOLD) & (size - 1); + } + while (CIRC_CNT(idx, tail, size) > 0) { tmp = (struct dpa_ptp_data *)(circ_buf->buf) + idx; idx = (idx - 1) & (size - 1); @@ -584,7 +589,6 @@ int dpa_ptp_init(struct dpa_priv_s *priv) if (!tsu) return -ENOMEM; - memset(tsu, 0, sizeof(*tsu)); tsu->valid = TRUE; tsu->dpa_priv = priv; diff --git a/drivers/net/ethernet/freescale/dpa/dpaa_1588.h b/drivers/net/ethernet/freescale/dpa/dpaa_1588.h index eda0e3a..85e2629 100644 --- a/drivers/net/ethernet/freescale/dpa/dpaa_1588.h +++ b/drivers/net/ethernet/freescale/dpa/dpaa_1588.h @@ -26,8 +26,8 @@ #include <linux/circ_buf.h> #include <linux/fsl_qman.h> -#define DEFAULT_PTP_RX_BUF_SZ 2048 -#define DEFAULT_PTP_TX_BUF_SZ 1024 +#define DEFAULT_PTP_RX_BUF_SZ 256 +#define DEFAULT_PTP_TX_BUF_SZ 256 /* 1588 private ioctl calls */ #define PTP_ENBL_TXTS_IOCTL SIOCDEVPRIVATE @@ -92,6 +92,9 @@ enum { #define DPA_PTP_NOMINAL_FREQ_PERIOD 5 /* 5ns -> 200M */ #define NANOSEC_PER_SECOND 1000000000 +/* The threshold between the current found one and the oldest one */ +#define TS_ACCUMULATION_THRESHOLD 50 + /* Struct needed to identify a timestamp */ struct dpa_ptp_ident { u8 version; |