Author: mav
Date: Mon Apr 20 10:29:42 2015
New Revision: 281764
URL: https://svnweb.freebsd.org/changeset/base/281764
Log:
Disable RX/TX queues notifications when not needed.
This reduces CPU load and doubles iperf throughput, reaching 2-3Gbit/s.
MFC after: 2 weeks
Sponsored by: iXsystems, Inc.
Modified:
head/usr.sbin/bhyve/pci_virtio_net.c
Modified: head/usr.sbin/bhyve/pci_virtio_net.c
==============================================================================
--- head/usr.sbin/bhyve/pci_virtio_net.c Mon Apr 20 09:07:12 2015
(r281763)
+++ head/usr.sbin/bhyve/pci_virtio_net.c Mon Apr 20 10:29:42 2015
(r281764)
@@ -393,6 +393,7 @@ pci_vtnet_ping_rxq(void *vsc, struct vqu
*/
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 vqu
/* 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);
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