Re: knfsd and memory usage

[Neil Brown]

On Friday December 7, [e-mail] wrote:
> So I have this new file server (2.4.16), and it's memory looks like
> Mem:    771952K total,   767492K used,     4460K free,    22016K buffers
> Swap:        0K total,        0K used,        0K free,    71848K cached
> 
> So cache, buffers, and free memory account for ~100MB.
> There are a handful of userspace processes taking ~20MB.
> 
> Obviously I expect the kernel to take up some memory, but 650 megs?

Have a look at /proc/slabinfo.  It might show you where the memory is.

> 
> Is there I way I can find out where all of that memory went?
> If knfsd is hoarding (no other box has this much unaccounted for), is 
> there a way to tweak it at runtime?  Are there 'safe' things to adjust at 
> compile time?

knfsd directly uses about 20K per thread.  Maybe as much as 30.  Any
other memory usage is incidental and should be cleaned up by memory
pressure.

NeilBrown