Re: 2.4.5-ac1 won't boot with 4GB bigmem option

[Alan Cox]

>  > mm: critical shortage of bounce buffers.
> 
> Indeed this message has been pestering me in all the recent .4-acx kernels when
> the machine is under heavy FS pressure.
> 
> In these kernels I observe a significative (5-10%) performance degradation as
> soon as the FS cache fills up all the available memory, at this moment "kswapd"

Its there to prove we had a problem

> 2.4.2-acx and early 2.4.3-acx kernles were much better in this respect and a lot
> more stable.

Hit any 2.4 kernel pre 2.4.5 vanilla [maybe fixed] and you will break bigmem
that way.