Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

What is the difference between an ITLB and a TLB?

share|improve this question
Have you considered, you know, googling? It's in the references to the TLB wikipedia article. – Daniel Beck Apr 21 '11 at 17:50
up vote 5 down vote accepted

An ITLB (Instruction Translation Lookaside Buffer) only handles instructions, while a TLB handles both instructions and data. There could also be a DTLB, handling only data.

share|improve this answer
I looked up DTLB and it says that the D stands for dual, not data. – tony_sid Apr 21 '11 at 18:12
@OSXJedi Hard to believe in the context of contrasting it to ITLB. THe first few Google hits for "DTLB" also seem to side with "Data". I guess in that case it was probably standing alone. There are only so many letters in the alphabet. – Daniel Beck Apr 21 '11 at 18:15… The first link goes to the Wikipedia article, but the 2nd and 3rd links go to sites that interpret the D as "Dual." – tony_sid Apr 21 '11 at 19:17
@OSXJedi You get different results than me. Doesn't change what I wrote. If it's in the context of contrasting DTLB and ITLB, it's clearly Data. Also, you never even asked about it. Why are you so hung up about some bonus info I provided with answering your question? – Daniel Beck Apr 21 '11 at 19:21

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.