kern_mbuf.c patch

[Randall Stewart]

Andrew Gallatin wrote:
> Randall Stewart writes:
>  > Andrew Gallatin wrote:
>  > > Randall Stewart writes:
>  > >  >  	nmbclusters = 1024 + maxusers * 64;
>  > >  > +        nmbjumbop   = 100 + (maxusers * 4);
>  > > 
>  > > The limit on page-size jumbos seems far too small.  Since the socket
>  > > buffer code now uses page-sized jumbos, I'd expect to see its limit be
>  > > the same as nmbclusters.
>  > > 
>  > > 
>  > > Drew
>  > > 
>  > Drew:
>  > 
>  > Let me re-visit this .. I started real small on purpose.. so
>  > folks would complain ;-)
>  > 
>  > How about if I calculate the number of pages the
>  > nmbclusters use (I will go look in the UMA structures) and
>  > then make it so the limit is the same number of pages
>  > (scaled like nmbclusters) for each of the larger clusters..
> 
> That sounds reasonable to me, at least for nmbjumbop, but I'm not sure
> that the larger 9k and 16k clusters are used outside of drivers, so
> the nmbclusters limit may be too large for them.  But I suppose some
> limit is better than none :)
> 
> Drew
> 
SCTP uses the best fit size for user data.. thus 16k gets used
for large messages :-)

R

-- 
Randall Stewart
NSSTG - Cisco Systems Inc.
803-345-0369 <or> 803-317-4952 (cell)