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net/batching: add envknobs to disable UDP GRO & GSO

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It is sometimes useful when diagnosing subtle and specific performance
problems to rule out GRO/GSO independently and/or toggle them to
influence packet pacing.

Updates #17835
Updates tailscale/corp#31164

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2025-11-25 20:07:06 -08:00
parent 824027305a
commit 4469ec329c
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1 changed files with 10 additions and 4 deletions
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14
net/batching/conn_linux.go
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@ -20,6 +20,7 @@ import (
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"golang.org/x/sys/unix"
"tailscale.com/envknob"
"tailscale.com/hostinfo"
"tailscale.com/net/neterror"
"tailscale.com/net/packet"
@ -328,10 +329,15 @@ func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
return
}
err = rc.Control(func(fd uintptr) {
_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
hasTX = errSyscall == nil
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
hasRX = errSyscall == nil
var errSyscall error
if !envknob.Bool("TS_DEBUG_DISABLE_UDP_GSO") {
_, errSyscall = syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
hasTX = errSyscall == nil
}
if !envknob.Bool("TS_DEBUG_DISABLE_UDP_GRO") {
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
hasRX = errSyscall == nil
}
})
if err != nil {
return false, false