On 15/01/2013 3:55 PM, Adrian Chadd wrote:
You're only doing one IO at the end. That's just plain silly. There's
all kinds of overhead that could show up, that would be amortized over
doing many IOs.
You should also realise that the raw disk IO on Linux is by default
buffered, so you're hitting the buffer cache. The results aren't going
to match, not unless you exhaust physical memory and start falling
behind on disk IO. At that point you'll see what the fuss is about.
To put is simply and maybe give a bit more context, here is what we're
doing:
1) Boot OS (Linux or FreeBSD in this case)
2) dd some image over to the SAS drive.
3) rinse and repeat for X times.
4) profit.
In this case if step 1) is done with Linux we get 100 times more profit.
I was wondering if we could close the gap.
Karim.
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