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reduce copying

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This commit is contained in:
Jay Wren
2025-11-11 14:51:53 -05:00
parent ef0a022375
commit 0f9b33aa36
2 changed files with 48 additions and 8 deletions
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10
interface.go
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@@ -297,7 +297,10 @@ func (f *Interface) listenIn(reader io.ReadWriteCloser, i int) {
func (f *Interface) listenInSingle(reader io.ReadWriteCloser, i int) {
packet := make([]byte, mtu)
out := make([]byte, mtu)
// Allocate out buffer with virtio header headroom (10 bytes) to avoid copies on write
const virtioNetHdrLen = 10
outBuf := make([]byte, virtioNetHdrLen+mtu)
out := outBuf[virtioNetHdrLen:] // Use slice starting after headroom
fwPacket := &firewall.Packet{}
nb := make([]byte, 12, 12)
@@ -321,6 +324,7 @@ func (f *Interface) listenInSingle(reader io.ReadWriteCloser, i int) {
func (f *Interface) listenInBatch(reader io.ReadWriteCloser, batchReader BatchReader, i int) {
batchSize := batchReader.BatchSize()
const virtioNetHdrLen = 10
// Allocate buffers for batch reading
bufs := make([][]byte, batchSize)
@@ -330,7 +334,9 @@ func (f *Interface) listenInBatch(reader io.ReadWriteCloser, batchReader BatchRe
sizes := make([]int, batchSize)
// Per-packet state (reused across batches)
out := make([]byte, mtu)
// Allocate out buffer with virtio header headroom to avoid copies on write
outBuf := make([]byte, virtioNetHdrLen+mtu)
out := outBuf[virtioNetHdrLen:]
fwPacket := &firewall.Packet{}
nb := make([]byte, 12, 12)