Messages in this thread |  | | Subject | Re: speed difference between using hard-linked and modular drives? | Date | Fri, 9 Nov 2001 12:59:09 +0000 (GMT) | From | Alan Cox <> |
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> Oh no, not this again... > > It _IS_ a big deal. Fetching _ONE_ hash chain cache line > is always going to be cheaper than fetching _FIVE_ to _TEN_ > page struct cache lines while walking the list.
Big picture time. What costs more - the odd five cache line hit or swapping 200Kbytes/second on and off disk ? - thats obviously workload dependant.
Perhaps at some point we need to accept there is a memory/speed tradeoff throughout the kernel and we need a CONFIG option for it - especially for the handheld world. I don't want to do lots of I/O on an ipaq, I don't need big tcp hashes, and I'd rather take a small performance hit.
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