Re: MM VM patches was: 2.6.3-mm4

[Nick Piggin]

Mike Fedyk wrote:

> Andrew Morton wrote:
>
> > shrink_slab-for-all-zones.patch
> >   vm: scan slab in response to highmem scanning
> >
> > zone-balancing-fix.patch
> >   vmscan: zone balancing fix
>
>
> On 2.6.3 + [1] + nfsd-lofft.patch running on a 1GB ram file server.   
> I have noticed two related issues.
>
> First, under 2.6.3 it averages about 90MB[2] anon memory, and 30MB 
> with the -mm4 vm (the rest is in swap cache).  This could balance out 
> on the normal non-idle week-day load though...
>
> Second the -mm4 vm, there is a lot more swapping[3] going on during 
> the daily updatedb, and backup runs that are performed on this machine.
> I'd have to call this second issue a regression, but I want to run it 
> a couple more days to see if it gets any better (unless you agree of 
> course).

There are a few things backed out now in 2.6.4-rc1-mm1, and quite a
few other changes. I hope we can trouble you to test 2.6.4-rc1-mm1?

Tell me, do you have highmem enabled on this system? If so, swapping
might be explained by the batching patch. With it, a small highmem
zone could possibly place quite a lot more pressure on a large
ZONE_NORMAL.

2.6.4-rc1-mm1 sould do much better here.

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