Messages in this thread |  | | | Date | Wed, 05 Dec 2001 12:13:34 -0800 | | From | Andrew Morton <> | | Subject | Re: /proc/sys/vm/(max|min)-readahead effect???? |
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Roy Sigurd Karlsbakk wrote: > > hi all > > I've just upgraded to 2.4.16 to get /proc/sys/vm/(max|min)-readahead > available. I've got this idea... > > If lots of files (some hundered) are read simultaously, I waste all the > i/o time in seeks. However, if I increase the readahead, it'll read more > data at a time, and end up with seeking a lot less. > > The harddrive I'm testing this with, is a cheap 20G IDE drive.
/proc/sys/vm/*-readhead is a no-op for IDE. It doesn't do anything. You must use echo file_readahead:100 > /proc/ide/ide0/hda/settings to set the readhead to 100 pages (409600 bytes).
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