Getting/Forcing Greater than 4KB Buffer Allocations

[David Christensen]

> > I'm investigating a problem with my bce driver which occurs 
> when I ask
> > for a jumbo mbuf cluster (through m_cljget()).  When I map the  
> > memory for DMA I
> > normally get 3 memory segments (4KB + 4KB + 1KB) on my system, but  
> > on another
> > user's system he's seeing 2 memory segments (8KB + 1KB).  Is there a
> > configurationoption that allows this or some other tuning variable  
> > involved?  The
> > system is a Xeon dual-core processor and has 8GB of RAM, 
> running an  
> > AMD64 version of
> > the kernel.
> 
> Hi, Dave--
> 
> Is "sysctl hw.pagesize" different on the two systems?  It sure looks  
> like the first machine is using a 4KB pagesize, whereas the second  
> machine is using an 8KB pagesize...
> 

That was one of my first questions but they are identical, 4096 bytes.

Dave