Messages in this thread |  | | Date | Thu, 8 Nov 2001 18:37:57 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: speed difference between using hard-linked and modular drives? |
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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
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