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Use legacy interrupts as a default. This gives up to 10% speedup

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when used in qemu (and this driver is for non-PCIe cards,
so probably its largest use is in virtualized environments).

Approved by:	Jack Vogel
MFC after:	3 days
This commit is contained in:
Luigi Rizzo 2012-07-25 11:28:15 +00:00
parent 6c889456a8
commit 8d1717963b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=238765
1 changed files with 34 additions and 0 deletions
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34
sys/dev/e1000/if_lem.c
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@ -239,6 +239,7 @@ static void lem_enable_wakeup(device_t);
static int lem_enable_phy_wakeup(struct adapter *);
static void lem_led_func(void *, int);
#define EM_LEGACY_IRQ /* slightly faster, at least in qemu */
#ifdef EM_LEGACY_IRQ
static void lem_intr(void *);
#else /* FAST IRQ */
@ -1549,6 +1550,13 @@ lem_xmit(struct adapter *adapter, struct mbuf **m_headp)
u32 txd_upper, txd_lower, txd_used, txd_saved;
int error, nsegs, i, j, first, last = 0;
extern int netmap_drop;
if (netmap_drop == 95) {
dropme:
m_freem(*m_headp);
*m_headp = NULL;
return (ENOBUFS);
}
m_head = *m_headp;
txd_upper = txd_lower = txd_used = txd_saved = 0;
@ -1688,6 +1696,9 @@ lem_xmit(struct adapter *adapter, struct mbuf **m_headp)
}
}
if (netmap_drop == 96)
goto dropme;
adapter->next_avail_tx_desc = i;
if (adapter->pcix_82544)
@ -1715,6 +1726,16 @@ lem_xmit(struct adapter *adapter, struct mbuf **m_headp)
*/
ctxd->lower.data |=
htole32(E1000_TXD_CMD_EOP | E1000_TXD_CMD_RS);
if (netmap_drop == 97) {
static int count=0;
if (count++ & 63 != 0)
ctxd->lower.data &=
~htole32(E1000_TXD_CMD_RS);
else
D("preserve RS");
}
/*
* Keep track in the first buffer which
* descriptor will be written back
@ -1733,6 +1754,12 @@ lem_xmit(struct adapter *adapter, struct mbuf **m_headp)
adapter->link_duplex == HALF_DUPLEX)
lem_82547_move_tail(adapter);
else {
extern int netmap_repeat;
if (netmap_repeat) {
int x;
for (x = 0; x < netmap_repeat; x++)
E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), i);
}
E1000_WRITE_REG(&adapter->hw, E1000_TDT(0), i);
if (adapter->hw.mac.type == e1000_82547)
lem_82547_update_fifo_head(adapter,
@ -2986,6 +3013,13 @@ lem_txeof(struct adapter *adapter)
return;
}
#endif /* DEV_NETMAP */
{
static int drops = 0;
if (netmap_copy && drops++ < netmap_copy)
return;
drops = 0;
}
if (adapter->num_tx_desc_avail == adapter->num_tx_desc)
return;