How do I control TCP delayed ACK and delayed sending?

Solution Verified - Updated -


  • We see 40ms delays in Linux responding to ACKs. Why is this? How do I control it?
  • We see small data sends (eg: one byte) delayed over network communication. Why is this? How do I control it?
  • Can I set net.ipv4.tcp_delack_min kernel tunable on RHEL?
  • Does RHEL include the quickack route tunable to apply TCP_NODELAY without setsockopt()?


  • Red Hat Enterprise Linux
  • Red Hat Enterprise Linux MRG Realtime
  • Red Hat Enterprise Linux Realtime
  • Network communication over TCP socket

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content