what is the meaning of "optimization changed from TIME to SPACE"

[Brian]

ivan dimitrov wrote:
> After upgrading from freebsd-5.5-R to 6.3-R, I get the following message in dmesg:
>
> "/storage/pub/www/ram: optimization changed from TIME to SPACE"
>
> I use a ram disk via the md driver.
> Here is the line from my fstab file:
>
> md      /storage/pub/www/ram    mfs     rw,-s4m                 2       0
>
> Does this mean that there is some sort of error? ...and is there anything that can be done, so that I don't get this message in dmesg?
>
> Any help will be greatly appreciated :)
>
>        
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When I have seen this error in the past, the partition in question is 
near or at capacity.

Brian