Re: speed difference between using hard-linked and modular drives?

Ingo Molnar
2001-11-08T16:40:33Z

On Thu, 8 Nov 2001, Ingo Molnar wrote:

> > Are there any speed difference between hard-linked device drivers and
> > their modular counterparts?
>
> minimal. a few instructions per IO.

Arjan pointed out that there is also the cost of TLB misses due to
vmalloc()-ing module libraries, which can be as high as a 5% slowdown.

we should fix this by trying to allocate continuous physical memory if
possible, and fall back to vmalloc() only if this allocation fails.

Ingo