When I call net.IOCountersWithContext，memory increase slowly?

[wocan23]

Describe the bug
When I call net.IOCountersWithContext，memory increase slowly. And When I remove that piece of code，memory stable to a certain value，is it the problem of my code?

To Reproduce

	ctx, cancel := context.WithTimeout(context.TODO(), 3*time.Second)
	defer cancel()
	oldIOCountersStats,_ := net.IOCountersWithContext(ctx,false)
	time.Sleep(time.Second)
	newIOCountersStats,_ := net.IOCountersWithContext(ctx,false)
	serverInfo.BytesSent = newIOCountersStats[0].BytesSent - oldIOCountersStats[0].BytesSent
	serverInfo.BytesRecv = newIOCountersStats[0].BytesRecv - oldIOCountersStats[0].BytesRecv

Environment (please complete the following information):

• Windows: [paste the result of ver]
• Linux: [paste contents of /etc/os-release and the result of uname -a]
• Mac OS: [paste the result of sw_vers and uname -a
• FreeBSD: [paste the result of freebsd-version -k -r -u and uname -a]
• OpenBSD: [paste the result of uname -a]