Re: 2.4.8preX VM problems

Marcelo Tosatti
2001-08-07T00:28:27Z

On Sat, 4 Aug 2001, Anton Blanchard wrote:

>
> > > The patch below allowed us to get close to 4G of page cache before
> > > things slowed down again and kswapd took over.
> >
> > How much memory do you have on the box ?
>
> It has 15G, so 512M of lowmem and 14.5G of highmem.

Can you please use readprofile to find out where kswapd is spending its
time when you reach 4G of pagecache ?

I've never seen kswapd burn CPU time except cases where a lot of memory is
anonymous and there is a need for lots of swap space allocations.
(scan_swap_map() is where kswapd spends "all" of its time in such
workloads)