remote debugging packets

["Manoj Verma, Noida" <manojv@noida.hcltech.com>]

Hi,
I am doing remote debugging using GDB server over ethernet. Both host and
target are i386-linux machines.

On the Gdb client side: 
(gdb) break main
(gdb) set debug remote 1
(gdb) step

I see the following (Snapshot-1) packet transaction between Gdb client and
Gdb server. 

My question is, 
1) I did the "step" only once but why there are three packets (sometimes two
packets) corresponding to the "step" ($s#73...Ack) as shown below in
sanpshot-1, evenif the correct response is received for the first packet. 

2) On the Gdb client side when I continue, "(gdb) continue", why it first
sends a packet ($s#73...Ack) and then the packet ($c#63...Ack) as shown
below in sanpshot-2 ? It should only send the packet ($c#63...Ack).

Kindly clarify. 


******************************** Sanpshot-1
*********************************
(gdb) s
Sending packet: $m4000e4f0,1#bd...Ack
Packet received: 55
Sending packet: $M4000e4f0,1:cc#9d...Ack
Packet received: OK
Sending packet: $m40050444,1#5f...Ack
Packet received: 55
Sending packet: $M40050444,1:cc#3f...Ack
Packet received: OK
Sending packet: $s#73...Ack
Packet received: T0505:b8faffbf;04:a0faffbf;08:85840408;
Sending packet: $s#73...Ack
Packet received: T0505:b8faffbf;04:a0faffbf;08:88840408;
Sending packet: $s#73...Ack
Packet received: T0505:b8faffbf;04:a0faffbf;08:8b840408;
Sending packet: $M4000e4f0,1:55#41...Ack
Packet received: OK
Sending packet: $M40050444,1:55#e3...Ack
Packet received: OK
16              z += func1();

****************************************************************************
****

and 

******************************** Sanpshot-2
*********************************
(gdb) c
Continuing.
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $s#73...Ack
Packet received: T0505:b8faffbf;04:98faffbf;08:f5840408;
Sending packet: $m8048466,1#3e...Ack
Packet received: c7
Sending packet: $M8048466,1:cc#1e...Ack
Packet received: OK
Sending packet: $m80484ce,1#9a...Ack
Packet received: c7
Sending packet: $M80484ce,1:cc#7a...Ack
Packet received: OK
Sending packet: $m4000e4f0,1#bd...Ack
Packet received: 55
Sending packet: $M4000e4f0,1:cc#9d...Ack
Packet received: OK
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $c#63...Ack
Packet received: T0505:98faffbf;04:8cfaffbf;08:fb840408;

****************************************************************************
****

Any clarification would be appreciated.