Re: FIBMAP ioctl restrictions: why?

Jamie Lokier (lkd@tantalophile.demon.co.uk)
Tue, 9 Nov 1999 17:32:56 +0100

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Stephen C. Tweedie wrote:
> If we're going to modify the kernel for this, far better to go in the
> direction of kernel async IO. That way you can just submit all the IOs
> to the kernel at once and let it sort the IOs itself. The kernel may
> have a much better idea about the ideal IO ordering than you do,

I tried this for a large number of stat() calls using threads, for
various small numbers of threads. Surprise, the optimal number was 1
thread. No IO ordering improvement.

-- Jamie

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