Atmega32 Running slow at half frequency

[ark5230]

I am using Atmega32.
using delay routine _delay_ms(10000)
from
#include <util/delay.h>
The timing I am getting is 20 seconds instead of 10 seconds.
What could be probable reason !!.

 

[nandhu015]

Did you set the clock frequency with fcpu?

 

[ark5230]

Working with AVRStudio, and frequency is properly set.
Actual crystal frequency 11.0592 MHz reducing it to half of the value makes the timing correct. As I have to use serial communication in remaining modules, this may create problems.