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    SubjectRe: VM in v2.4.0test9
    Rik van Riel wrote:
    >
    > On Wed, 4 Oct 2000, David Weinehall wrote:
    >
    > > Running the included program on a clean v2.4.0test9 kernel I can
    > > hang the computer practically in no time.
    >
    > > What seems most strange is that the doesn't even get depleated.
    > > The machine still answers to SysRq and ping, but nothing else.
    >
    > Looking again at this report in more detail, something
    > very strange is going on ...
    >
    > > This is what I got from SysRq+M (manual copy):
    > >
    > > Free pages: 500 kB (0 highmem)
    > > Active: 8 inactive dirty: 1009, inactive clean:0
    > > free: 125 (31 62 93)
    >
    > First, you have MORE free memory than freepages.high. In this
    > case I really don't see why __alloc_pages() wouldn't give the
    > memory to your processes ....
    >

    Hmm...
    Can't it be a zone problem?
    Free pages is the total free - all zones.
    But suppose you want a page from a specific zone - DMA, the more
    memory you have the less likely that you have a DMA page free...
    Does all test take this into consideration?

    > > Free swap: 64772
    >
    > And there is tons of swap free...
    >
    > Are you absolutely sure this is VM related? This almost looks
    > like the system puts a in a read request but the request queue
    > doesn't get unplugged, or something strange like that ...
    >
    > There is more than enough memory to satisfy all VM requests and
    > the loop in __alloc_pages() is straightforward enough to give
    > your processes their memory without strange bugs ...
    >
    > regards,
    >
    > Rik
    > --
    > "What you're running that piece of shit Gnome?!?!"
    > -- Miguel de Icaza, UKUUG 2000
    >
    > http://www.conectiva.com/ http://www.surriel.com/
    >
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