Re: VM in v2.4.0test9

[Roger Larsson]

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
> 
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