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virtio-devices: net: Improve throughput with virtio features

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By merging receive buffers through the VIRTIO_NET_F_MRG_RXBUF feature,
as well as enabling the use of indirect descriptors through
VIRTIO_RING_F_INDIRECT_DESC feature, we achieve better throughput for
the virtio-net device without hurting its latency.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2021-11-03 17:22:03 +01:00 committed by Rob Bradford
parent 495d4eb896
commit 58d25b3ccc
1 changed files with 5 additions and 1 deletions
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6
virtio-devices/src/net.rs
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@ -34,7 +34,9 @@ use std::{collections::HashMap, convert::TryInto};
use versionize::{VersionMap, Versionize, VersionizeResult}; use versionize::{VersionMap, Versionize, VersionizeResult};
use versionize_derive::Versionize; use versionize_derive::Versionize;
use virtio_bindings::bindings::virtio_net::*; use virtio_bindings::bindings::virtio_net::*;
use virtio_bindings::bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX; use virtio_bindings::bindings::virtio_ring::{
VIRTIO_RING_F_EVENT_IDX, VIRTIO_RING_F_INDIRECT_DESC,
};
use virtio_queue::Queue; use virtio_queue::Queue;
use vm_memory::{ByteValued, GuestMemoryAtomic}; use vm_memory::{ByteValued, GuestMemoryAtomic};
use vm_migration::VersionMapped; use vm_migration::VersionMapped;
@ -398,7 +400,9 @@ impl Net {
| 1 << VIRTIO_NET_F_HOST_TSO4 | 1 << VIRTIO_NET_F_HOST_TSO4
| 1 << VIRTIO_NET_F_HOST_TSO6 | 1 << VIRTIO_NET_F_HOST_TSO6
| 1 << VIRTIO_NET_F_HOST_UFO | 1 << VIRTIO_NET_F_HOST_UFO
| 1 << VIRTIO_NET_F_MRG_RXBUF
| 1 << VIRTIO_RING_F_EVENT_IDX | 1 << VIRTIO_RING_F_EVENT_IDX
| 1 << VIRTIO_RING_F_INDIRECT_DESC
| 1 << VIRTIO_F_VERSION_1; | 1 << VIRTIO_F_VERSION_1;
if iommu { if iommu {