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SubjectRe: (RFC): SKB Initialization
> The patch reduces the numer of cylces by 25%

Er, I'm not getting that from just the numbers you show.

The total ave number of cycles in alloc_skb before is approx 268.

Total number of cycles in alloc_skb after is approx 468.

So in order to reduce the total ave number of cycles, you
need __kfree_skb to reduce by more than approx 200. (Since
thats where you moved the code to).

So unless we see the total cycles in __kfree_skb, how
do we know? Or what am I missing?

thanks,
Nivedita


You said:



CPU 0 CPU 1
------ ------
Avg cycles in alloc_skb: 64.05 203.39
Avg cycles in __kfree_skb: 127.54 228.95
------ -------
Total Avg Cycles 191.59 432.34
------ -------
# of times alloc_skb called: 235,478 2,060,422
# of times __kfree_skb called: 2,063,276 232,359


Linux 2.5.25+Skbinit Patch:
--------------------------
CPU 0 CPU 1
----- -----
Avg cycles in alloc skb: 237.21 230.91
# of times alloc_skb called: 1,226,594 1,213,327





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