device: allow reducing queue constants on iOS

Heavier network extensions might require the wireguard-go component to
use less ram, so let users of this reduce these as needed.

At some point we'll put this behind a configuration method of sorts, but
for now, just expose the consts as vars.

Requested-by: Josh Bleecher Snyder <josh@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2021-05-22 00:57:42 +02:00
parent 99e8b4ba60
commit c27ff9b9f6
3 changed files with 12 additions and 11 deletions

View file

@ -35,7 +35,6 @@ const (
/* Implementation constants */
const (
UnderLoadQueueSize = QueueHandshakeSize / 8
UnderLoadAfterTime = time.Second // how long does the device remain under load after detected
MaxPeers = 1 << 16 // maximum number of configured peers
)

View file

@ -210,7 +210,7 @@ func (device *Device) Down() error {
func (device *Device) IsUnderLoad() bool {
// check if currently under load
now := time.Now()
underLoad := len(device.queue.handshake.c) >= UnderLoadQueueSize
underLoad := len(device.queue.handshake.c) >= QueueHandshakeSize/8
if underLoad {
atomic.StoreInt64(&device.rate.underLoadUntil, now.Add(UnderLoadAfterTime).UnixNano())
return true

View file

@ -7,13 +7,15 @@
package device
/* Fit within memory limits for iOS's Network Extension API, which has stricter requirements */
const (
QueueStagedSize = 128
QueueOutboundSize = 1024
QueueInboundSize = 1024
QueueHandshakeSize = 1024
MaxSegmentSize = 1700
PreallocatedBuffersPerPool = 1024
// Fit within memory limits for iOS's Network Extension API, which has stricter requirements.
// These are vars instead of consts, because heavier network extensions might want to reduce
// them further.
var (
QueueStagedSize = 128
QueueOutboundSize = 1024
QueueInboundSize = 1024
QueueHandshakeSize = 1024
PreallocatedBuffersPerPool uint32 = 1024
)
const MaxSegmentSize = 1700