Date: Mon, 20 Apr 2015 10:29:42 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r281764 - head/usr.sbin/bhyve Message-ID: <201504201029.t3KATgM4050967@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
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);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201504201029.t3KATgM4050967>