> Some form of read-behind will give us optimal performance
> when the tiles are a lot smaller (say 1/4th) than the VM
> 'stripe size' we are using.
Still wearning my "I'm not sure its always a good idea to second
guess the application hat" -- do we actually have any applications
that would make use of this?
The only one I can think of is that I have large databases (well, 1
GB or so) that have sequentially grown and at time, we do queries
that requires us walking backwards though the data here, but I don't
think it uses mmap.
I know other `theorietical applications' exist that produce this
pattern, but then I can find `theorietical applications' that have
any kind of screwy access pattern.
> The actual disk I/O, of course, is still done in forward
> direction :)
True... but if this is an issue, gobs of disk and RAID can help,
especially when it comes to random seeks.
-cw
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