On Wed, 7 Jul 1999, Matthew Dillon wrote:
> :> limit ought to work for a 4G machine
> :>
> :> Since most of those news files were small, I think Kirk's news test code
> :> is pretty much the worse case scenario as far as vnode allocation goes.
> :
> : Well, I could possibly live with 256MB, but the vnode/fsnode consumption
> :seems to be getting a bit silly in the memory overhead department, even for
> :machines with 4GB of RAM. It seems like there needs to be fewer of them
> :and/or they need to go on a diet.
> :
> :-DG
> :
> :David Greenman
>
> Well, the problem occurs because the system has sufficient memory to keep
> the underlying VM object around. The current vnode code will not place
> a vnode on the free list until the underlying VM object goes away. The
> 60MB worth of KVM being used to hold vnodes is supporting 1GB worth
> of cached VM pages ( associated with small files, that is ). So even
> though the numbers look strange, it does seem to scale.
>
> In order to turn the maxvnodes sysctl into a harder limit, the vnode
> allocation & freeing code would have to be reworked some. Right now
> vnodes are not placed back onto the free list until their underlying
> VM objects go away. We would need to make the vnode lists (which are
> headed by mount table entries) LRU and then attempt to reuse the vnodes
> that way, destroying the underlying VM object when necessary.
>
> Alternatively we can try to make the vnode structure smaller, or we
> could try to decouple the vnode from the VM object and instead reference
> the VM object by inode. All I can say to that: Yuch. I'd rather just
> bump up the KVM.
or do what Kirk wants to do and merge the VM and Vnode structures
I belive the UVM does a bit in this direction due to kirk's influence.
julian
>
> -Matt
> Matthew Dillon
> <[EMAIL PROTECTED]>
>
>
>
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