On Jun 10, 2009, at 15:43, Amit Gud <agud@xxxxxxxxxx> wrote:
Trond Myklebust wrote:
On Tue, 2009-06-09 at 18:32 -0700, Amit Gud wrote:
This patch adds 4 new NFS mount options(acdirminms, acdirmaxms,
acregminms,
acregmaxms) converting already existing one into a millisecond
resolution
instead of seconds.
Also, modifies the mountstats output to milliseconds instead of
seconds.
Why, exactly, do you need to control cache timeouts down to the
millisecond level?
The problem is to make the updates visible from one client to the
other
in less than a second and turning off caching entirely has an
unacceptably high penalty.
Specifics, please: updates of what, exactly? Are we talking
attributes, data or directory contents?
What is your application, and why does 1ms constitute an acceptable
caching timeout, while 1s does not?
Trond
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