timeout exponentially backoff ?

i use net-snmp-5.2.1. i found follwing lines in file "snmp_api.h":

struct snmp_session {
    /*
     * Protocol-version independent fields
     */
    /** snmp version */
    long            version;
    /** Number of retries before timeout. */
    int             retries;
    /** Number of uS until first timeout, then exponential backoff */
    long            timeout;        
    ...

it seems that timeout will exponentially backoff, but when i snoop the 
packets of timeout snmpget,it seems  it's not the case:

snmpget -v1 -cwrongcomm 192.168.0.155 sysName.0
snoop -ta 'port 161 and 192.168.0.155'

the packets snooped:

17:31:13.34230      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:14.35042      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:15.36033      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:16.37032      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:17.38036      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54
17:31:18.39037      192.168.0.219 -> 192.168.0.155 UDP D=161 S=42494 LEN=54

it retried the default 5 times, and the each interval is almost the default 
1 second.

timeout really exponentially backoff ?




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