Messages in this thread | | | Date | Mon, 7 Oct 2002 12:24:36 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 - (NUMA)) |
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On Mon, 7 Oct 2002, Daniel Phillips wrote: > > Devices have a few MB of readahead cache, the kernel can have thousands of > times as much.
I don't think that is in the least realistic.
There's _no_ way that the krenel could do physical readahead for more than a few tens or hundreds of kB - the latency impact would just be too much to handle, and the VM impact is not likely insignificant either.
So the device readahead is _not_ noticeably smaller than what the kernel can reasonably do, and it does a better job of it (ie disks can fill track buffers optimally, depending on where the head hits etc).
Linus
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