Messages in this thread | | | Date | Mon, 27 Aug 2001 21:04:38 +0200 | From | Daniel Phillips <> | Subject | Re: [resent PATCH] Re: very slow parallel read performance |
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On August 27, 2001 08:37 pm, Oliver Neukum wrote: > Hi, > > > - Readahead cache is naturally a fifo - new chunks of readahead > > are added at the head and unused readahead is (eventually) > > culled from the tail. > > do you really want to do this based on pages ? Should you not drop all > pages associated with the inode that wasn't touched for the longest > time ?
Isn't that very much the same as dropping pages from the end of the readahead queue?
> If you are streaming dropping all should be no great loss.
The quesion is, how do you know you're streaming? Some files are read/written many times and some files are accessed randomly. I'm trying to avoid penalizing these admittedly rarer, but still important cases.
-- Daniel
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