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Add support for a netisr polling tunable, which allows run time switching of

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device polling rather than having it only be controlled by the compile
time option.

Summary: Rubicon Communications (Netgate)

Reviewers: #network, hiren

Reviewed By: #network, hiren

Subscribers: hiren

Differential Revision: https://reviews.freebsd.org/D2258
This commit is contained in:
gnn 2015-04-08 20:25:51 +00:00
parent 3de33e9ea5
commit 468eb00d1f
1 changed files with 18 additions and 5 deletions
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23
sys/net/netisr.c
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@ -126,6 +126,13 @@ static struct rmlock netisr_rmlock;
static SYSCTL_NODE(_net, OID_AUTO, isr, CTLFLAG_RW, 0, "netisr");
#ifdef DEVICE_POLLING
static int netisr_polling = 0; /* Enable Polling. */
TUNABLE_INT("net.isr.polling_enable", &netisr_polling);
SYSCTL_INT(_net_isr, OID_AUTO, polling_enable, CTLFLAG_RW,
&netisr_polling, 0, "Enable polling");
#endif
/*-
* Three global direct dispatch policies are supported:
*
@ -789,9 +796,11 @@ swi_net(void *arg)
nwsp = arg;
#ifdef DEVICE_POLLING
KASSERT(nws_count == 1,
("%s: device_polling but nws_count != 1", __func__));
netisr_poll();
if (netisr_polling) {
KASSERT(nws_count == 1,
("%s: device_polling but nws_count != 1", __func__));
netisr_poll();
}
#endif
#ifdef NETISR_LOCKING
NETISR_RLOCK(&tracker);
@ -816,7 +825,8 @@ swi_net(void *arg)
NETISR_RUNLOCK(&tracker);
#endif
#ifdef DEVICE_POLLING
netisr_pollmore();
if (netisr_polling)
netisr_pollmore();
#endif
}
@ -1071,6 +1081,9 @@ netisr_sched_poll(void)
{
struct netisr_workstream *nwsp;
if (!netisr_polling)
return;
nwsp = DPCPU_ID_PTR(nws_array[0], nws);
NWS_SIGNAL(nwsp);
}
@ -1138,7 +1151,7 @@ netisr_init(void *arg)
* multiple netisr threads, so for the time being compiling in device
* polling disables parallel netisr workers.
*/
if (netisr_maxthreads != 1 || netisr_bindthreads != 0) {
if (netisr_polling && (netisr_maxthreads != 1 || netisr_bindthreads != 0)) {
printf("netisr_init: forcing maxthreads to 1 and "
"bindthreads to 0 for device polling\n");
netisr_maxthreads = 1;