Date: Sun, 18 Sep 2005 19:07:05 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Erez Zadok <ezk@cs.sunysb.edu> Cc: freebsd-fs@freebsd.org, christos@zoulas.com Subject: Re: turning off the NFS attribute cache Message-ID: <20050918230705.GA54054@xor.obsecurity.org> In-Reply-To: <200509182257.j8IMvqgb008168@agora.fsl.cs.sunysb.edu> References: <200509182257.j8IMvqgb008168@agora.fsl.cs.sunysb.edu>
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On Sun, Sep 18, 2005 at 06:57:52PM -0400, Erez Zadok wrote:
> After fixing this in Amd, I went on to verify that things work for other
> OSs. When I got to FreeBSD 4.6, I found that it always caches directory
> entries, and there is no way to turn it off completely. Specifically, if I
> set the ac{reg,dir}{min,max} fields in struct nfs_args all to zero, the
> kernel seems to cache the entries for a default number of seconds (I counted
> something like 5 seconds). On some OSs, setting these four fields to 0
> turns off the attribute cache, but not on FreeBSD 4.6. I was able to verify
> this using Amd and a script that exercises the interaction of the kernel's
> attrcache and Amd. I didn't look at the kernel sources (yet) but I'm pretty
> certain of this behavior.
FreeBSD 4.6 is, frankly, ancient..are you certain this still applies
to modern versions?
Kris
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