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; _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
