aic7xxx slowness on 2.6.13

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hi ,
       I  installed 2.6.13 over the weekend  on a dual Pentium Xeon 2.4 Ghz with 6 GB RAM (My fileserver) running Debian Sarge.
My fileserver uses external infrotrend raid . 
 
On switching to 2.6.13 I also switched from my older slower Symbios 53c895   to Adaptec 3960D
 
I have noticed when using the adaptec card my file server performs slower than the Symbios 
card.
 
As an example I tried to copy my Mail folder of 66.8 M  and this is what I see .
 
with symbios 53c895 
 
bash-2.05$ time cp -pa Mail Mail.mips
real     0m6.048s
user    0m0.007s
sys     0m0.295s
 
 
with adaptec 3960D
bash-2.05$ time cp -pa Mail Mail.mips
real     0m49.543s
user    0m0.000s
sys     0m0.044s
 
 
I wonder anybody is experiencing this . 
 
Thanks
yogesh
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