Re: 4mb PAGES for mbuf clusters

["km b" <kmb810@xxxxxxxxx>]

On 7/15/07, Matthew Dillon <dillon@apollo.backplane.com> wrote:
>     Alan announced it a few months ago. I'm trying to find the reference.
>     I'll bet you can search the freebsd mail archives to find it.

Thanks. Now I know who announced it. Maybe it'll make searching easier.

>     Again, though, the issue is not so much implementing the large
>     pages but implementing mechanisms that prevent fragmentation from
>     making it impossible to construct physically contiguous pages that
>     are that large.

To avoid memory fragmentation what I am thinking is that at system
startup reserve two memory pools for mbufs and use just one of them.
When it becomes fragmented (upto 80% or user configurable), switch to
the next one and recover the fragmented memory. However, this may not
be a general solution but at least it may work for specific workloads.

Cheers
kmb

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Something is wrong up on cloud # 9!


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Something is wrong up on cloud # 9!