[OpenAFS] cache use topping out at around 3GB?

[Kris Van Hees]

I can confirm I saw the same behaviour with 1.3.82 a few days ago, when I was
doing some unrelated testing.  Haven't had time to track down the problem yet
though.  Given that it is still present in 1.3.84, I'll have a look at it (if
someone else doesn't get to it first).

	Kris

On Tue, Jun 07, 2005 at 01:42:56AM -0400, Matthew Miller wrote:
> I have a system which, for sad, sad reasons I cannot change, is on a 10mbit
> half-duplex connection, and I want to regularly process about 6GB of data
> from AFS through it. (About 4000 files.)
> 
> I made an 8GB cache partition, and am using the standard Linux init script
> options of "-fakestat -stat 4000 -dcache 4000 -daemons 6 -volumes 256
> -files 50000".
> 
> Here's the problem: the cache fills up nicely and everything seems fine
> until it reaches slightly below 3,000,000K. Then, it bounces around the
> 2,9xx,xxx range, never exceeding the three million mark. For example:
> 
>  AFS using 2968603 of the cache's available 8200000 1K byte blocks.
>  ...
>  AFS using 2969391 of the cache's available 8200000 1K byte blocks.
>  ...
>  AFS using 2970271 of the cache's available 8200000 1K byte blocks.
>  ...
>  AFS using 2969728 of the cache's available 8200000 1K byte blocks.
>  ...
>  AFS using 2970824 of the cache's available 8200000 1K byte blocks.
> 
> 
> And since this is smaller than the dataset, it basically makes the cache get
> completely flushed through on every run, making it useless.
> 
> Odds are pretty good I'm missing something that should be obvious here, but
> I can't figure out what. Your help is very much appreciated!
> 
> 
> This system is Linux 2.6.x with 1.3.84. (I think the issue is there with
> earlier 1.3.x too -- now that I look, I see a system with 1.3.80 with a
> cache stuck at 2968345 of 8254000.) I have some FTP server systems running
> Linux 2.4.x and OpenAFS 1.2.13, and they happily go along with "AFS using
> 7447189 of the cache's available 8254000 1K byte blocks" or so.
> 
> -- 
> Matthew Miller           mattdm@mattdm.org        <http://www.mattdm.org/>
> Boston University Linux      ------>                <http://linux.bu.edu/>
> Current office temperature: 80 degrees Fahrenheit.
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