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Change the default to not use packet counters to generate rx interrupts.

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Rely solely on the timer based mechanism.

Update man page to reflect this change.

MFC after:	1 week
This commit is contained in:
np 2012-04-30 09:46:05 +00:00
parent e42771f14b
commit 45cd6b589c
3 changed files with 12 additions and 10 deletions
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9
share/man/man4/cxgbe.4
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@ -1,4 +1,4 @@
.\" Copyright (c) 2011, Chelsio Inc
.\" Copyright (c) 2011-2012, Chelsio Inc
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
@ -145,10 +145,9 @@ dev.cxgbe.X.holdoff_tmr_idx sysctl.
The packet-count index value to use to delay interrupts.
The packet-count list has the values 1, 8, 16, and 32 by default
and the index selects a value from this list.
The default value is 2 for both 10Gb and 1Gb ports, which means 16
packets (or the holdoff timer going off) before an interrupt is
generated.
-1 disables packet counting.
The default value is -1 for both 10Gb and 1Gb ports, which means packet
counting is disabled and interrupts are generated based solely on the
holdoff timer value.
Different cxgbe interfaces can be assigned different values via the
dev.cxgbe.X.holdoff_pktc_idx sysctl.
This sysctl works only when the interface has never been marked up (as done by

4
sys/dev/cxgbe/t4_main.c
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@ -174,7 +174,7 @@ TUNABLE_INT("hw.cxgbe.nofldrxq1g", &t4_nofldrxq1g);
static int t4_tmr_idx_10g = TMR_IDX_10G;
TUNABLE_INT("hw.cxgbe.holdoff_timer_idx_10G", &t4_tmr_idx_10g);
#define PKTC_IDX_10G 2
#define PKTC_IDX_10G (-1)
static int t4_pktc_idx_10g = PKTC_IDX_10G;
TUNABLE_INT("hw.cxgbe.holdoff_pktc_idx_10G", &t4_pktc_idx_10g);
@ -182,7 +182,7 @@ TUNABLE_INT("hw.cxgbe.holdoff_pktc_idx_10G", &t4_pktc_idx_10g);
static int t4_tmr_idx_1g = TMR_IDX_1G;
TUNABLE_INT("hw.cxgbe.holdoff_timer_idx_1G", &t4_tmr_idx_1g);
#define PKTC_IDX_1G 2
#define PKTC_IDX_1G (-1)
static int t4_pktc_idx_1g = PKTC_IDX_1G;
TUNABLE_INT("hw.cxgbe.holdoff_pktc_idx_1G", &t4_pktc_idx_1g);

9
sys/dev/cxgbe/t4_sge.c
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@ -1420,9 +1420,12 @@ init_iq(struct sge_iq *iq, struct adapter *sc, int tmr_idx, int pktc_idx,
iq->flags = 0;
iq->adapter = sc;
iq->intr_params = V_QINTR_TIMER_IDX(tmr_idx) |
V_QINTR_CNT_EN(pktc_idx >= 0);
iq->intr_pktc_idx = pktc_idx;
iq->intr_params = V_QINTR_TIMER_IDX(tmr_idx);
iq->intr_pktc_idx = SGE_NCOUNTERS - 1;
if (pktc_idx >= 0) {
iq->intr_params |= F_QINTR_CNT_EN;
iq->intr_pktc_idx = pktc_idx;
}
iq->qsize = roundup(qsize, 16); /* See FW_IQ_CMD/iqsize */
iq->esize = max(esize, 16); /* See FW_IQ_CMD/iqesize */
strlcpy(iq->lockname, name, sizeof(iq->lockname));