RE: db_file_multiblock_read_count causing full scans to takelonger?

In my case, it's filesystem.  Is there a parameter that determines
read-aheads?  I'll look for HP-UX but if you know of a Linux or other OS
parameter, it would make it easier for me to frame the question.  As a
result of this discussion I re-ran the "time dd" tests and found that
the elbow is right before "bs=256k".  Even "bs=255k" is faster (and as
fast as 128, 32, anything less than 256).



On Tue, 2006-12-19 at 13:03 -0800, Kevin Closson wrote:
>  Is this direct I/O or a filesystem? Could the filesystem
> be firing off some uneccessary read-aheads when you do large
> dfmbrc but not when you are nibbling with smaller multiblock request?
> 


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