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From: "George V. Neville-Neil" <gnn@FreeBSD.org>
Date: Wed, 8 Apr 2015 20:25:51 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r281276 - head/sys/net
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X-List-Received-Date: Wed, 08 Apr 2015 20:25:52 -0000
Author: gnn
Date: Wed Apr 8 20:25:51 2015
New Revision: 281276
URL: https://svnweb.freebsd.org/changeset/base/281276
Log:
Add support for a netisr polling tunable, which allows run time switching of
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
Modified:
head/sys/net/netisr.c
Modified: head/sys/net/netisr.c
==============================================================================
--- head/sys/net/netisr.c Wed Apr 8 20:10:42 2015 (r281275)
+++ head/sys/net/netisr.c Wed Apr 8 20:25:51 2015 (r281276)
@@ -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 @@ out:
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;