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net: optimize WriteToUDPAddrPort

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See the recent change optimizing WriteMsgUDPAddrPort
for an explanation of why this change includes copy/paste/modify
instead of implementing WriteToUDP using WriteToUDPAddrPort.

name                          old time/op    new time/op    delta
WriteToReadFromUDPAddrPort-8    5.02µs ± 3%    4.71µs ± 2%   -6.31%  (p=0.000 n=15+14)

name                          old alloc/op   new alloc/op   delta
WriteToReadFromUDPAddrPort-8     68.0B ± 0%      4.0B ± 0%  -94.12%  (p=0.000 n=15+15)

name                          old allocs/op  new allocs/op  delta
WriteToReadFromUDPAddrPort-8      3.00 ± 0%      1.00 ± 0%  -66.67%  (p=0.000 n=15+15)

Change-Id: I301715e774de07eb6ccb4e329ccf2e554609abc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/360599
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2021-11-01 13:23:39 -07:00
parent 0b37bd9b3f
commit 433ba582f7
3 changed files with 38 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/net/udpsock.go
View File

@ -207,11 +207,14 @@ func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
// WriteToUDPAddrPort acts like WriteTo but takes a netip.AddrPort.
func (c *UDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
// TODO(bradfitz): make this efficient, making the internal net package
// type throughout be netip.Addr and only converting to the net.IP slice
// version at the edge. But for now (2021-10-20), this is a wrapper around
// the old way.
return c.WriteToUDP(b, UDPAddrFromAddrPort(addr))
if !c.ok() {
return 0, syscall.EINVAL
}
n, err := c.writeToAddrPort(b, addr)
if err != nil {
err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addrPortUDPAddr{addr}, Err: err}
}
return n, err
}
// WriteTo implements the PacketConn WriteTo method.

4
src/net/udpsock_plan9.go
View File

@ -53,6 +53,10 @@ func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
return len(b), nil
}
func (c *UDPConn) writeToAddrPort(b []byte, addr netip.AddrPort) (int, error) {
return c.writeTo(b, UDPAddrFromAddrPort(addr)) // TODO: optimize instead of allocating
}
func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
return 0, 0, syscall.EPLAN9
}

26
src/net/udpsock_posix.go
View File

@ -109,6 +109,32 @@ func (c *UDPConn) writeTo(b []byte, addr *UDPAddr) (int, error) {
}
}
func (c *UDPConn) writeToAddrPort(b []byte, addr netip.AddrPort) (int, error) {
if c.fd.isConnected {
return 0, ErrWriteToConnected
}
if !addr.IsValid() {
return 0, errMissingAddress
}
switch c.fd.family {
case syscall.AF_INET:
sa, err := addrPortToSockaddrInet4(addr)
if err != nil {
return 0, err
}
return c.fd.writeToInet4(b, sa)
case syscall.AF_INET6:
sa, err := addrPortToSockaddrInet6(addr)
if err != nil {
return 0, err
}
return c.fd.writeToInet6(b, sa)
default:
return 0, &AddrError{Err: "invalid address family", Addr: addr.Addr().String()}
}
}
func (c *UDPConn) writeMsg(b, oob []byte, addr *UDPAddr) (n, oobn int, err error) {
if c.fd.isConnected && addr != nil {
return 0, 0, ErrWriteToConnected