Messages in this thread | | | Subject | Re: An idea for prefetching swapped memory... | From | Christophe Saout <> | Date | 07 Apr 2003 13:36:29 +0200 |
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Am Mon, 2003-04-07 um 12.21 schrieb Con Kolivas:
> > With this feature there should be no performance decrease because only free > > resources would be used, and if pages were swapped in but not be used, they > > stay not dirty and so have not to be written to disk when they are swapped > > out again. But the improvements should be obvious if simply the last swaped > > out pages are swapped in again... > > This has been argued before. Why would the last swapped out pages be the best > to swap in? The vm subsystem has (somehow) decided they're the least likely > to be used again so why swap them in?
Are you sure this is working? When I'm watching a video ofer NFS on my machine which is idle (just X and mplayer, gnome in background, 256 MB of memory, 512 swap), after 30 minutes or so, the playback starts to jump. The cpu usage is below 10%, and it even does this when both X and mplayer are renice to -19 (!). So the VM swapped everything out and after 30 minutes it starts to swap out X oder mplayer itself, which is immediately swapped back in but the video jumps... :-(
-- Christophe Saout <christophe@saout.de>
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