Cache Memory in top command

Bas Smeelen b.smeelen at
Sat Oct 2 11:56:50 UTC 2010


From: Bas Smeelen [mailto:b.smeelen at]
To: freebsd-questions at
Sent: Thu, 30 Sep 2010 14:44:57 +0200
Subject: Re: Cache Memory in top command

On 09/30/2010 01:37 PM, RW wrote:
  > On Thu, 30 Sep 2010 09:24:58 +0200
  > Bas Smeelen <b.smeelen at> wrote:
  >> *Wired:* number of pages wired down, including cached file data pages
  > That refers to buffer pages (displayed as Buf), which are a subset of
  > the cached file data pages.
  > The pages in the cache queue are not specifically cached file data
  > pages, they are clean pages from any source, including pages that have
  > been written to swap.

  Thanks. I got this completely wrong, though I have read the FAQ a few years ago.
The values shown by top(1) labeled as Inact, Cache, and Buf are all cached data at different aging levels.  

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