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How a probe uses RAM
Chapter 14: Understanding How a Probe Uses RAM 313
any memory for Observer. To capture packets on 64-bit Windows install either more than or less
than 4 GB of RAM.
2.
32-bit operating systems do not support more than 4 GB of RAM. Observer cannot use any RAM
above 4 GB.
1.
To see how much protected memory the probe has, click the
Memory
Management tab .
2. Click the Configure Memory button at the top of the window to view and
modify how Observer uses the protected memory for this probe instance. The
Edit Probe Instance window opens.
On the Edit Probe Instance window, you can see how memory is allocated for:
●
Packet capture
●
Statistics queue buffer
You can also see how much protected memory is still available in the
Windows memory pool.
3.
Use the arrows to the right of the Packet capture and Statistics queue buffer
to increase or decrease the amount of RAM you want dedicated to each. See
How to allocate the reserved RAM (page 315) to help determine how to
divide the memory.
4. After reserving memory for Observer you must restart the system for the
changes to take affect. After you restart the system you can allocate the
memory to the different probe instances.
How packet capture affects RAM
When you start a packet capture (Capture > Packet Capture and click Start ), all
packets that Observer sees are placed into the packet capture buffer (a specific
portion of the protected memory). The packets stay in this protected memory
until the buffer is cleared. If you are using a circular packet buffer, new packets
overwrite old ones after the buffer is full.
Figure 145 (page 314) shows how Observer receives a packet and distributes it
throughout RAM, and how it is written to disk for packet capture and GigaStor
capture.
Packets received by the network card are passed to Observer, where Observer
puts each packet into RAM, specifically in the packet capture memory buffer
and the statistical queue buffer. If a packet must be written to disk for either a
GigaStor capture or a Packet Capture, it is copied from the RAM and written to
the disk.