Messages in this thread | | | Subject | Re: An idea for prefetching swapped memory... | From | (Måns Rullgård) | Date | 07 Apr 2003 13:48:17 +0200 |
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Christophe Saout <christophe@saout.de> writes:
> > > 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... :-(
How much of your memory is in use? Are you sure there isn't a memory leak somewhere in mplayer?
-- Måns Rullgård mru@users.sf.net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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