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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
