Messages in this thread | | | Date | Thu, 29 Apr 2004 13:57:23 +1000 | From | Nick Piggin <> | Subject | Re: ~500 megs cached yet 2.6.5 goes into swap hell |
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Andrew Morton wrote: > 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. >
I'm not very impressed with the pagecache use-once logic, and I have a patch to remove it completely and treat non-mapped touches (IMO) more sanely. - 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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