Author: sephe Date: Fri Feb 19 05:03:17 2016 New Revision: 295792 URL: https://svnweb.freebsd.org/changeset/base/295792
Log: hyperv/hn: Add option to bind TX taskqueues to the specified CPU It will be used to help tracking host side transmission ring selection issue; and it will be turned on by default, once we have concrete result. Reviewed by: adrian, Jun Su <junsu microsoft com> Approved by: adrian (mento) MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5316 Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c ============================================================================== --- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Fri Feb 19 05:02:17 2016 (r295791) +++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Fri Feb 19 05:03:17 2016 (r295792) @@ -269,6 +269,10 @@ static int hn_use_txdesc_bufring = 1; SYSCTL_INT(_hw_hn, OID_AUTO, use_txdesc_bufring, CTLFLAG_RD, &hn_use_txdesc_bufring, 0, "Use buf_ring for TX descriptors"); +static int hn_bind_tx_taskq = -1; +SYSCTL_INT(_hw_hn, OID_AUTO, bind_tx_taskq, CTLFLAG_RDTUN, + &hn_bind_tx_taskq, 0, "Bind TX taskqueue to the specified cpu"); + /* * Forward declarations */ @@ -383,8 +387,20 @@ netvsc_attach(device_t dev) if (hn_tx_taskq == NULL) { sc->hn_tx_taskq = taskqueue_create("hn_tx", M_WAITOK, taskqueue_thread_enqueue, &sc->hn_tx_taskq); - taskqueue_start_threads(&sc->hn_tx_taskq, 1, PI_NET, "%s tx", - device_get_nameunit(dev)); + if (hn_bind_tx_taskq >= 0) { + int cpu = hn_bind_tx_taskq; + cpuset_t cpu_set; + + if (cpu > mp_ncpus - 1) + cpu = mp_ncpus - 1; + CPU_SETOF(cpu, &cpu_set); + taskqueue_start_threads_cpuset(&sc->hn_tx_taskq, 1, + PI_NET, &cpu_set, "%s tx", + device_get_nameunit(dev)); + } else { + taskqueue_start_threads(&sc->hn_tx_taskq, 1, PI_NET, + "%s tx", device_get_nameunit(dev)); + } } else { sc->hn_tx_taskq = hn_tx_taskq; } @@ -2409,7 +2425,18 @@ hn_tx_taskq_create(void *arg __unused) hn_tx_taskq = taskqueue_create("hn_tx", M_WAITOK, taskqueue_thread_enqueue, &hn_tx_taskq); - taskqueue_start_threads(&hn_tx_taskq, 1, PI_NET, "hn tx"); + if (hn_bind_tx_taskq >= 0) { + int cpu = hn_bind_tx_taskq; + cpuset_t cpu_set; + + if (cpu > mp_ncpus - 1) + cpu = mp_ncpus - 1; + CPU_SETOF(cpu, &cpu_set); + taskqueue_start_threads_cpuset(&hn_tx_taskq, 1, PI_NET, + &cpu_set, "hn tx"); + } else { + taskqueue_start_threads(&hn_tx_taskq, 1, PI_NET, "hn tx"); + } } SYSINIT(hn_txtq_create, SI_SUB_DRIVERS, SI_ORDER_FIRST, hn_tx_taskq_create, NULL); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
