2.4.3-ac2 -- How do I determine if shm is being used?

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I have mounted:

        none on /var/shm type shm (rw)
        tmpfs on /dev/shm type tmpfs (rw)

Yet, running "x11perf -shmput10" gives me:

X Error of failed request: BadValue (integer parameter out of range for
operation)
  Major opcode of failed request: 146 (MIT-SHM)
  Minor opcode of failed request: 3 (X_ShmPutImage)
  Value in failed request: 0x1600001
  Serial number of failed request: 35107
  Current serial number in output stream: 35111

I'd like to check to make sure that shm is actually accessible
to my programs. Is there any easy way to do this?

I have already checked the values of:

        /proc/sys/kernel/shmall = 2000000
        /proc/sys/kernel/shmmax = 4096
        /proc/sys/kernel/shmmni = 35000000

Thanks,
        Miles
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