Oracle 10g on SuSE 9 with kernel 2.6.4

Question

Hi,
i have installed Oracle 10g on SuSE 9 Professional with kernel 2.4.21-192 and it works fine.
For testing purposes i have installed a 2.6.4 Kernel and get the following error on database startup:
SQL> Connected to an idle instance
SQL> ORA-27125: unable to create shared memory segment
Linux Error: 1: Operation not permitted
SQL> Disconnected
Do you have any hints or is the kernel 2.6 not supported.
Thanks Klaus

Answer 1

/* using strace I have narrowed this down to the shmget call for allocating SGA memory. Specifically 2.6 kernel generates a WAIT in this call and Oracle specify IPC_NOWAIT flag, hence the failure condition.*/
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
extern int errno;
#define SHM_HUGETLB 04000
#define SGA_SIZE 192937984
#define dprintf(x) printf(x)
#define ADDR 3285588844UL
main()
int shmid;
int i, j, k;
volatile char *shmaddr;
if ((shmid = shmget(ADDR, SGA_SIZE, IPC_CREAT|IPC_NOWAIT|IPC_EXCL|0660) )
< 0) {
perror("IPC_NOWAIT Failure:\nTry without NOWAIT condition");
if ((shmid = shmget(ADDR, SGA_SIZE, IPC_CREAT|IPC_EXCL|0660) )
< 0) {
perror("Failure:");
exit(1);
printf("shmid: 0x%x\n", shmid);
shmaddr = shmat(shmid, (void *)ADDR, SHM_RND) ;
if (errno != 0) {
perror("Shared Memory Attach Failure:");
exit(2);
printf("shmaddr: %p\n", shmaddr);
dprintf("Starting the writes:\n");
for (i=0;i<SGA_SIZE;i++) {
shmaddr[i] = (char) (i);
if (!(i%(1024*1024))) dprintf(".");
dprintf("\n");
dprintf("Starting the Check...");
for (i=0; i<SGA_SIZE;i++)
if (shmaddr[i] != (char)i)
printf("\nIndex %d mismatched.");
dprintf("Done.\n");
if (shmdt((const void *)shmaddr) != 0) {
perror("Detached Failure:");
exit (3);