question about packed structures

[Christian Boon <c.boon@xxxxxxxxxxxxxxxxxxxx>]

Hello,

for my application i use a shared memory segment that multiple processes 
can read from and write to.
It uses an array of structs.

When i define the structs with  __attribute__ ((packed)) i save around 
100K of memory.
I wonder if this 100K is worth the effort of making the structs packed.

Is there a performance penalty for making the structs packed or is that 
minimal?

i use a pxa255 processor.

thanks,

Chris.


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