Messages in this thread | | | Date | Wed, 28 Apr 2004 18:53:42 -0700 | From | Andrew Morton <> | Subject | Re: ~500 megs cached yet 2.6.5 goes into swap hell |
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Paul Mackerras <paulus@samba.org> wrote: > > Andrew Morton writes: > > > My point is that decreasing the tendency of the kernel to swap stuff out is > > wrong. You really don't want hundreds of megabytes of BloatyApp's > > untouched memory floating about in the machine. Get it out on the disk, > > use the memory for something useful. > > What I have noticed with 2.6.6-rc1 on my dual G5 is that if I rsync a > gigabyte or so of data over to another machine, it then takes several > seconds to change focus from one window to another. I can see it > slowly redraw the window title bars. It looks like the window manager > is getting swapped/paged out. > > This machine has 2.5GB of ram, so I really don't see why it would need > to swap at all. There should be plenty of page cache pages that are > clean and not in use by any process that could be discarded. It seems > like as soon as there is any memory shortage at all it picks on the > window manager and chucks out all its pages. :( >
I suspect rsync is taking two passes across the source files for its checksumming thing. If so, this will defeat the pagecache use-once logic. The kernel sees the second touch of the pages and assumes that there will be a third touch.
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