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hyperv/hn: Add option to bind TX taskqueues to the specified CPU

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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
This commit is contained in:
Sepherosa Ziehau 2016-02-19 05:03:17 +00:00
parent ad73b30173
commit 5788ded618
1 changed files with 30 additions and 3 deletions
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33
sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
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@ -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);