diff options
| author | Claudio Jeker <claudio@cvs.openbsd.org> | 2010-11-10 15:23:26 +0000 |
|---|---|---|
| committer | Claudio Jeker <claudio@cvs.openbsd.org> | 2010-11-10 15:23:26 +0000 |
| commit | 55d0bbb1041c69069dbf176ccd140898d931bfc7 (patch) | |
| tree | 48789e319119896e6c7bb376fcb18ac0db6b7e3a /sys/dev | |
| parent | 27722dccc8614c464c25bbb960415ae2dd1aa482 (diff) | |
Enable low latency interrupt moderation and set the LL interval
to the maximum value to reduce the number of low latency interrupts
hitting the card when the ring is getting full.
Tested at least by deraadt@ on 99 and myself on 99 and 98 ix(4).
OK mikeb@
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/pci/if_ix.c | 12 | ||||
| -rw-r--r-- | sys/dev/pci/ixgbe_type.h | 3 |
2 files changed, 12 insertions, 3 deletions
diff --git a/sys/dev/pci/if_ix.c b/sys/dev/pci/if_ix.c index c580c9163c7..13ba32acfb8 100644 --- a/sys/dev/pci/if_ix.c +++ b/sys/dev/pci/if_ix.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_ix.c,v 1.45 2010/10/27 20:48:27 deraadt Exp $ */ +/* $OpenBSD: if_ix.c,v 1.46 2010/11/10 15:23:25 claudio Exp $ */ /****************************************************************************** @@ -657,6 +657,11 @@ ixgbe_init(void *arg) if (sc->hw.mac.type == ixgbe_mac_82599EB) { gpie |= IXGBE_SDP1_GPIEN; gpie |= IXGBE_SDP2_GPIEN; + /* + * Set LL interval to max to reduce the number of low latency + * interrupts hitting the card when the ring is getting full. + */ + gpie |= 0xf << IXGBE_GPIE_LLI_DELAY_SHIFT; } /* Enable Fan Failure Interrupt */ @@ -2483,6 +2488,7 @@ ixgbe_initialize_receive_units(struct ix_softc *sc) uint32_t rxctrl, fctrl, srrctl, rxcsum; uint32_t reta, mrqc, hlreg, linkvec; uint32_t random[10]; + uint32_t llimod = 0; int i; /* @@ -2516,8 +2522,10 @@ ixgbe_initialize_receive_units(struct ix_softc *sc) IXGBE_WRITE_REG(&sc->hw, IXGBE_SRRCTL(0), srrctl); /* Set Queue moderation rate */ + if (sc->hw.mac.type == ixgbe_mac_82599EB) + llimod = IXGBE_EITR_LLI_MOD; for (i = 0; i < IXGBE_MSGS; i++) - IXGBE_WRITE_REG(&sc->hw, IXGBE_EITR(i), DEFAULT_ITR); + IXGBE_WRITE_REG(&sc->hw, IXGBE_EITR(i), DEFAULT_ITR | llimod); /* Set Link moderation lower */ linkvec = sc->num_tx_queues + sc->num_rx_queues; diff --git a/sys/dev/pci/ixgbe_type.h b/sys/dev/pci/ixgbe_type.h index 361ea8861c0..3fa9b69c48f 100644 --- a/sys/dev/pci/ixgbe_type.h +++ b/sys/dev/pci/ixgbe_type.h @@ -1,4 +1,4 @@ -/* $OpenBSD: ixgbe_type.h,v 1.6 2010/02/25 10:56:07 jsg Exp $ */ +/* $OpenBSD: ixgbe_type.h,v 1.7 2010/11/10 15:23:25 claudio Exp $ */ /****************************************************************************** @@ -1077,6 +1077,7 @@ #define IXGBE_GPIE_EIMEN 0x00000040 /* Immediate Interrupt Enable */ #define IXGBE_GPIE_EIAME 0x40000000 #define IXGBE_GPIE_PBA_SUPPORT 0x80000000 +#define IXGBE_GPIE_LLI_DELAY_SHIFT 7 #define IXGBE_GPIE_RSC_DELAY_SHIFT 11 #define IXGBE_GPIE_VTMODE_MASK 0x0000C000 /* VT Mode Mask */ #define IXGBE_GPIE_VTMODE_16 0x00004000 /* 16 VFs 8 queues per VF */ |