diff options
| author | jakllsch <jakllsch@NetBSD.org> | 2023-01-03 19:33:31 +0000 |
|---|---|---|
| committer | jakllsch <jakllsch@NetBSD.org> | 2023-01-03 19:33:31 +0000 |
| commit | cb6d5de685fa6737a6a2fca3d37e9f589aa12dfe (patch) | |
| tree | b2ae64d2b94fe3fdfc2fa53a25b0557db572e306 /sys/dev | |
| parent | d8e0b302659408b493dd67c46deaa38c02f398b9 (diff) | |
Subtly adjust criteria for notification of Virtio devices in
VIRTIO_F_RING_EVENT_IDX mode.
This fixes stalls in the vioif(4) transmit path that would happen sooner
or later, depending on interface transmit utilization, and were
particularly noticable with a NetBSD guest transmitting to its x86 KVM
host at multi-gigabit speeds.
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/pci/virtio.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/dev/pci/virtio.c b/sys/dev/pci/virtio.c index 38f7ecb2a66..39301d61cc2 100644 --- a/sys/dev/pci/virtio.c +++ b/sys/dev/pci/virtio.c @@ -1,4 +1,4 @@ -/* $NetBSD: virtio.c,v 1.64 2022/12/30 21:38:13 jakllsch Exp $ */ +/* $NetBSD: virtio.c,v 1.65 2023/01/03 19:33:31 jakllsch Exp $ */ /* * Copyright (c) 2020 The NetBSD Foundation, Inc. @@ -28,7 +28,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.64 2022/12/30 21:38:13 jakllsch Exp $"); +__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.65 2023/01/03 19:33:31 jakllsch Exp $"); #include <sys/param.h> #include <sys/systm.h> @@ -1148,7 +1148,7 @@ notify: uint16_t o, n, t; uint16_t flags; - o = virtio_rw16(sc, vq->vq_avail->idx); + o = virtio_rw16(sc, vq->vq_avail->idx) - 1; n = vq->vq_avail_idx; /* |
