Re: VM behaviour under 2.4.5-ac21

[Marcelo Tosatti]

On Sat, 30 Jun 2001, J . A . Magallon wrote:

> 
> On 20010629 Martin Knoblauch wrote:
> >Hi,
> >
> > just something positive for the weekend. With 2.4.5-ac21, the behaviour
> >on my laptop (128MB plus twice the sapw) seems a bit more sane. When I
> >start new large applications now, the "used" portion of VM actually
> >pushes against the cache instead of forcing stuff into swap. It is still
> >using swap, but the effects on interactivity are much lighter.
> >
> 
> I was just going to say the same. After ac20, I think, the kernel stopped
> pre-allocating swap.
> Before I had always some swap used even if I was only using half my core memory
> (256Mb). And growing. I have not seen the box touch the swap since ac20.
> It uses all the ram it can get for cache, but does not send anything  to swap
> to use its ram for cache.
> Now running ac21 while building ac22, and state is:
> werewolf:/usr/src# free
>              total       used       free     shared    buffers     cached
> Mem:        255588     241044      14544       2168       8836     153752
> -/+ buffers/cache:      78456     177132
> Swap:       152576          0     152576
> werewolf:/usr/src# vmstat
>    procs                      memory    swap          io     system         cpu
>  r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
>  1  0  0      0   6944   8836 153868   0   0    16    12   95   385  17   3  80
> 

Weird: there is no VM change between ac20 and 21.