Re: NFS cache consistancy appears to be broken...

[Jeff Garzik]

Steve Dickson wrote:
> Hey Trond,
>
> The attached patch seems to break cache consistence in a big way....
> Doing the following:
> 1. On server:
> $ mkdir ~/t
> $ echo Hello > ~/t/tmp
>
> 2. On client, wait for a string to appear in this file:
> $ until grep -q foo t/tmp ; do echo -n . ; sleep 1 ; done
>
> 3. On server, create a *new* file with the same name containing that 
> string:
> $ mv ~/t/tmp ~/t/tmp.old; echo foo > ~/t/tmp
>
> will shows how the client will never (and I mean never ;-) ) see
> the updated file. I reverted this patch and everything started
> work as expected... so it appears using a jiffy-based cache
> verifiers may not be such a good idea....
>
> Note: I am using 2.6.15-rc2 kernel.

Very interesting.  This sounds similar to the problem I reported a week 
or so ago.  The circumstances were too unique to easily reproduce.

	Jeff




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