Cannot increase MAXUSERTASKS

Hi,
I´ve tried to increase the MAXUSERTASK Parameter (from 350 to 500) using dbmgui.
The DB cannot restart.
knldiag.err:
2008-02-06 09:03:28                          --- Starting GMT 2008-02-06 08:03:28           7.5.0    Build 034-121-118-234
2008-02-06 09:03:28 3071 ERR 11282 IPC      create_shm: shmget error, Invalid argument
2008-02-06 09:03:28 3071 ERR 11287 IPC      attach_shm: shmat error, Invalid argument id -1 flag 00 addr 0x0
2008-02-06 09:03:28 3071 ERR 11299 IPC      stat_shm: id           -1
2008-02-06 09:03:28 3071 ERR 11029 vmalloc malloc error, Failed to allocate TRACE space. Please check the critical database parameters
2008-02-06 09:03:28 3071 ERR 11029 vmalloc malloc error, These are MAXUSERTASKS, MAXSERVERTASKS, CACHE_SIZE and TRACE_PAGES_...
Where is the problem? Shared Memory from underlying linux?
regards,
Michael

Sorry,
I haven´t seen your remark on sysctl.conf.
Look at my sysctl.conf:
kernel.sem = 4096 512000 1600 2048
This values are very old. I had found them in madb mailing list years ago.
How do you size your values?
What if this values are too great for the machine?
regards,
Michael

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