copying a certain 2G file		

readahead	athena	backup
256	64.2	7.5
320	72.8	15.6
384	74.4	6.2
448	74.3	4.6
512	73.5	19.0
576	71.0	20.7
640	71.4	39.6
704	72.8	28.6
768	74.1	40.5
832	74.4	38.0
896	75.3	51.4
960	75.7	53.8
1024	77.6	57.2
		
1024	70.1	42.0
1280	73.9	44.1
1536	78.7	42.5
1792	76.1	44.5
2048	78.2	45.5
		
1500		51.1
1400		48.2
1300	69.4	41.1
1200	73.3	41.1
1100	72.6	46.2
1000	76.2	54.5
900	75.6	46.3
800	72.3	28.1
		
956	74.6	30.5
1034	70.7	31.6
956	74.4	33.9
1034	70.9	29.2
956	74.8	34.1