I have notice significant slow downs with disk I/O on a 32-bit PAE 3.3.X
kernels.
The test machine has 16GB memory, Intel i5 CPU, Intel
motherboard, and an Intel 160GB SSD. I copied 536M from one partition
on an SSD to another.
Test 1:
kernel 3.3.2 32-bit PAE with kernel parm mem=3G
time cp -ra testdir/ /tmp
real 0m8.989s
user 0m0.094s
sys 0m1.080s
Test 2:
kernel 3.3.2 32-bit PAE
time cp -ra testdir/ /tmp
real 1m17.068s
user 0m0.173s
sys 0m2.149s
Also I tested kernel 3.2.16 32-bit PAE with no memory limits and it
was in line with test 1.
Am I doing something wrong or could something have been broken in PAE
with kernel 3.3.X?
Thanks,
Joe Ceklosky
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