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SubjectRe: Linux-2.4.5
On Sat, 26 May 2001, Andrea Arcangeli wrote:
> On Sat, May 26, 2001 at 01:45:27AM -0300, Rik van Riel wrote:
> > 3) If the device driver needs to allocate something, it
> > has from zone->pages_min*3/4 down to zone->pages_min/4
> > space to allocate stuff, this should be very useful
> > for swap or mmap() over the network, or to encrypted
> > block devices, etc...
>
> Anything supposed to work because there's enough memory between
> zone->pages_min*3/4 and zone->pages_min/4 is just obviously broken
> period.

No. It's not about having enough memory between those levels.
It's about _failing_ the allocation when you reach a limit.

> > > Can you try to simply change NR_RESERVED to say 200*MAX_BUF_PER_PAGE
> > > and see if it makes a difference?
> >
> > No Comment(tm) *grin*
>
> I'm having lots of fun, thanks.

Now _this_ is tweaking magic limits ;)

cheers,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

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