Brad Hinson wrote:
Hi Rick,
dentunusd shows how many unused directory entries (dentries) you have in
the kernel's memory cache. Dentries are stored on disk, and contain
information about a specific directory. They're cached in memory for
faster access as you change directories. For a rough example, try
'mkidr /tmp/test; vi /tmp/test'.
Here's an article on managing this value. I'm sure there are many like
it, but this is just one approach:
http://rackerhacker.com/2008/12/03/reducing-inode-and-dentry-caches-to-keep-oom-killer-at-bay/
-Brad
Rick Truett wrote:
Hello, I am looking for an explanation of the value returned in the
dentunusd field from the sar -v command. I have values in teh millions
and would like to understand why the value is so high.
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Brad Hinson <[email protected]>
Sr. Support Engineer Lead, System z
Red Hat, Inc.
(919) 754-4198
www.redhat.com/z
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Brad, Thank you for your help. I found the website information helpful
that you supplied. FYI. We did a slabtop and it essentially stalled the
Linux system. We lost connections and could not login, CPU and paging
went thru the roof and after 30ish minutes it had to be rebooted. This
should act as a warning to anyone else wishing to run the command.....Do
it right before a scheduled IPL......
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