Contains mbuf structure registration information for the m_reg and m_dereg kernel services.
#include <sys/mbuf.h>struct mbreq {
                  int low_mbuf;
                  int low_clust;
                  int initial_mbuf;
                  int initial_clust;
}| Item | Description | 
|---|---|
| low_mbuf | Specifies the mbuf structure low-water mark. | 
| low_clust | Specifies the page-sized mbuf structure low-water mark. | 
| initial_mbuf | Specifies the initial allocation of mbuf structures. | 
| initial_clust | Specifies the initial allocation of page-sized mbuf structures. | 
The mbreq structure specifies the mbuf structure usage expectations for a user of mbuf kernel services.