I'm building a Linux box up for use with Oracle 8i.
The machine I'm using is a Dell Poweredge 2650 server with a pair of Xeon
Processors, 2GB of RAM, a disk array, etc, etc...
Part of building this machine up is tuning the kernel parameters for
shmmax, semmni, semmsl, semmns, etc...
In reading, this should be fairly ieasy... Make some changes to
/usr/include/linux/sem.h and /usr/include/linux/shm.h, recompile, install,
LILO, reboot, and yer done... Well, my experience wasn't that simple...
Here's a clip of my /usr/include/linux/shm.h
#define SHMMAX 0x3E00000 /* max shared seg size (bytes) */
#define SHMMIN 1 /* min shared seg size (bytes) */
#define SHMMNI 4096 /* max num of segs system wide */
#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
#define SHMSEG SHMMNI /* max shared segs per process */
...and what sysctl shows...
root@tom:/usr/include/linux# sysctl -a | grep shmmax
kernel/shmmax = 33554432
I can change this value with sysctl -p at boot time, but I would really
prefer it to be built into the kernel...
...now for semaphores...
#define SEMMNI 128 /* <= IPCMNI max # of semaphore identifiers */
#define SEMMSL 450 /* <= 8 000 max num of semaphores per id */
#define SEMMNS 1000 /* <= INT_MAX max # of semaphores in system */
#define SEMOPM 100 /* <= 1 000 max num of ops per semop call */
#define SEMVMX 32767 /* <= 32767 semaphore maximum value */
#define SEMAEM SEMVMX /* adjust on exit max value */
The only values I've changed are SEMMSL, and SEMMNS...
Looking at the semaphores, here's what I see...
root@tom:/usr/include/linux# cat /proc/sys/kernel/sem
250 32000 32 128
How would I sysctl these values?...
I would prefer them to be statically built into the kernel...
I know that the kernel SHOULD be the right version, and I've done a make
dep ; make clean ; make bzImage
My kernel version info...
root@tom:/usr/include/linux# cat /proc/sys/kernel/osrelease
root@tom:/usr/include/linux# cat /proc/sys/kernel/version
#4 SMP Tue Nov 19 16:21:21 PST 2002
Thanks muchly in advance!!!
Richard Whittaker, System Manager, NorthwesTel Inc. Whitehorse, Yukon, Canada.
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