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device: allow reducing queue constants on iOS

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

2
device/device.go
View file

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

20
device/queueconstants_ios.go
View file

@ -7,13 +7,15 @@
package device package device
/* Fit within memory limits for iOS's Network Extension API, which has stricter requirements */ // 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
const ( // them further.
QueueStagedSize = 128 var (
QueueOutboundSize = 1024 QueueStagedSize = 128
QueueInboundSize = 1024 QueueOutboundSize = 1024
QueueHandshakeSize = 1024 QueueInboundSize = 1024
MaxSegmentSize = 1700 QueueHandshakeSize = 1024
PreallocatedBuffersPerPool = 1024 PreallocatedBuffersPerPool uint32 = 1024
) )
const MaxSegmentSize = 1700