Messages in this thread | | | Subject | Re: [PATCH] x86: fix unconditional arch/x86/kernel/pcspeaker.c?compiling | From | Matt Mackall <> | Date | Sun, 20 Jan 2008 10:44:48 -0600 |
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On Sat, 2008-01-19 at 22:59 -0600, Rob Landley wrote: > On Friday 18 January 2008 11:10:19 Matt Mackall wrote: > > > * Disable support for readahead, page writeback, pdflush and swap > > > when we have no storage at all (typically booting from an > > > initramfs). This corresponds to 69 KB of source code! > > > > That'd be nice, yes. It would probably make sense to be able to disable > > just readahead support when we're working with only solid-state devices. > > Very nice. From a UI standpoint, shouldn't disabling the block layer take at > least some of that out?
There are a number of laptops now that ship with solid-state disks. These things look like normal IDE block devices to the kernel, but have zero seek time and zero rotational latency. So here, prefetch is a waste of memory and probably increases latency on average.
This will also be true for using prefetch on a typical embedded board using compact flash through an IDE interface controller (extremely common).
-- Mathematics is the supreme nostalgia of our time.
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