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Disable RX/TX queues notifications when not needed.

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This reduces CPU load and doubles iperf throughput, reaching 2-3Gbit/s.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.
This commit is contained in:
Alexander Motin 2015-04-20 10:29:42 +00:00
parent a22fc06636
commit d9a6698393
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281764
1 changed files with 4 additions and 0 deletions
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4
usr.sbin/bhyve/pci_virtio_net.c
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@ -393,6 +393,7 @@ pci_vtnet_ping_rxq(void *vsc, struct vqueue_info *vq)
*/
if (sc->vsc_rx_ready == 0) {
sc->vsc_rx_ready = 1;
vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
}
}
@ -438,6 +439,7 @@ pci_vtnet_ping_txq(void *vsc, struct vqueue_info *vq)
/* Signal the tx thread for processing */
pthread_mutex_lock(&sc->tx_mtx);
vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
if (sc->tx_in_progress == 0)
pthread_cond_signal(&sc->tx_cond);
pthread_mutex_unlock(&sc->tx_mtx);
@ -466,6 +468,7 @@ pci_vtnet_tx_thread(void *param)
for (;;) {
/* note - tx mutex is locked here */
do {
vq->vq_used->vu_flags &= ~VRING_USED_F_NO_NOTIFY;
if (sc->resetting)
have_work = 0;
else
@ -478,6 +481,7 @@ pci_vtnet_tx_thread(void *param)
assert(error == 0);
}
} while (!have_work);
vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
sc->tx_in_progress = 1;
pthread_mutex_unlock(&sc->tx_mtx);