w/cpuset throttling

qirst:/dev/cpuset/test# echo 1 >mems
qirst:/dev/cpuset/test# cat cpus

qirst:/dev/cpuset/test# echo 0 >cpus
qirst:/dev/cpuset/test# cat cpus

qirst:/dev/cpuset/test# time dd if=/dev/urandom of=/root/test bs=1024 count=500000
500000+0 records in
500000+0 records out
512000000 bytes (512 MB) copied, 83.681 seconds, 6.1 MB/s

real    1m23.683s
user    0m0.170s
sys     1m23.090s
qirst:/dev/cpuset/test# 

qirst:/dev/cpuset/test# time dd if=/dev/urandom of=/root/test bs=1024 count=500000
500000+0 records in
500000+0 records out
512000000 bytes (512 MB) copied, 85.7514 seconds, 6.0 MB/s

real    1m26.339s
user    0m0.080s
sys     1m22.400s
qirst:/dev/cpuset/test# time dd if=/dev/zero of=/root/test bs=1024 count=500000
500000+0 records in
500000+0 records out
512000000 bytes (512 MB) copied, 12.9976 seconds, 39.4 MB/s

Seems to be limited by urandom speed.

/dev/zero