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.
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parent
a22fc06636
commit
d9a6698393
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=281764
@ -393,6 +393,7 @@ pci_vtnet_ping_rxq(void *vsc, struct vqueue_info *vq)
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*/
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if (sc->vsc_rx_ready == 0) {
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sc->vsc_rx_ready = 1;
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vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
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}
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}
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@ -438,6 +439,7 @@ pci_vtnet_ping_txq(void *vsc, struct vqueue_info *vq)
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/* Signal the tx thread for processing */
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pthread_mutex_lock(&sc->tx_mtx);
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vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
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if (sc->tx_in_progress == 0)
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pthread_cond_signal(&sc->tx_cond);
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pthread_mutex_unlock(&sc->tx_mtx);
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@ -466,6 +468,7 @@ pci_vtnet_tx_thread(void *param)
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for (;;) {
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/* note - tx mutex is locked here */
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do {
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vq->vq_used->vu_flags &= ~VRING_USED_F_NO_NOTIFY;
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if (sc->resetting)
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have_work = 0;
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else
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@ -478,6 +481,7 @@ pci_vtnet_tx_thread(void *param)
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assert(error == 0);
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}
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} while (!have_work);
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vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
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sc->tx_in_progress = 1;
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pthread_mutex_unlock(&sc->tx_mtx);
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