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Optimal buffer sizes for Softnet socket (#351) 

* Optimal buffer sizes for Softnet socket

* Formatting
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Fedor Korotkov 2022-12-14 14:18:39 -05:00 committed by GitHub
parent c9caeab098
commit 81253417a4
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1 changed files with 7 additions and 3 deletions
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10
Sources/tart/Network/Softnet.swift
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@ -69,15 +69,19 @@ class Softnet: Network {
}
private func setSocketBuffers(_ fd: Int32, _ sizeBytes: Int) throws {
var option_value = sizeBytes
let option_len = socklen_t(MemoryLayout<Int>.size)
var ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &option_value, option_len)
// The system expects the value of SO_RCVBUF to be at least double the value of SO_SNDBUF,
// and for optimal performance, the recommended value of SO_RCVBUF is four times the value of SO_SNDBUF.
// See: https://developer.apple.com/documentation/virtualization/vzfilehandlenetworkdeviceattachment/3969266-maximumtransmissionunit
var receiveBufferSize = 4 * sizeBytes
var ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &receiveBufferSize, option_len)
if ret != 0 {
throw SoftnetError.InitializationFailed(why: "setsockopt(SO_RCVBUF) returned \(ret)")
}
ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &option_value, option_len)
var sendBufferSize = sizeBytes
ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sendBufferSize, option_len)
if ret != 0 {
throw SoftnetError.InitializationFailed(why: "setsockopt(SO_SNDBUF) returned \(ret)")
}