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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
2026-05-27 12:05:00 -07:00
committed by James Tucker
parent d1912167dc
commit dea49bb4da
1 changed files with 10 additions and 4 deletions
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net/batching/conn_linux.go
+10 -4
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@@ -20,6 +20,7 @@ import (
"golang.org/x/net/ipv4" "golang.org/x/net/ipv4"
"golang.org/x/net/ipv6" "golang.org/x/net/ipv6"
"golang.org/x/sys/unix" "golang.org/x/sys/unix"
"tailscale.com/envknob"
"tailscale.com/hostinfo" "tailscale.com/hostinfo"
"tailscale.com/net/neterror" "tailscale.com/net/neterror"
"tailscale.com/net/packet" "tailscale.com/net/packet"
@@ -433,10 +434,15 @@ func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
return return
} }
err = rc.Control(func(fd uintptr) { err = rc.Control(func(fd uintptr) {
_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT) var errSyscall error
hasTX = errSyscall == nil if !envknob.Bool("TS_DEBUG_DISABLE_UDP_GSO") {
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1) _, errSyscall = syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
hasRX = errSyscall == nil 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 { if err != nil {
return false, false return false, false