Performance of dd in solaris 10
I ran a test the other day of dd'ing an entire 9g drive to another 9g driver under solaris 9, and solaris 10. solaris 10 was 2x faster. I know sun had been working on performance enhancements, and had speeded up system calls and such, but this seems like a huge enhancement, esp for something that seems low level like dd. Does anybody have an explanation on what made dd so much faster under solaris 10 ?
I'll be looking forward to finding other features like this in solaris 10!
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SunOS 5.9 Generic_112233-05 sun4u sparc SUNW,UltraSPARC-IIi-Engine
# time dd bs=2048k if=/dev/rdsk/c1t1d0s2 of=/dev/rdsk/c1t6d0s2
4316+1 records in
4316+1 records out
real59:22.2
user0.0
sys10.0
SunOS 5.10 s10_69 sun4u sparc SUNW,UltraSPARC-IIi-Engine
# time dd bs=2048k if=/dev/rdsk/c1t1d0s2 of=/dev/rdsk/c1t6d0s2
4316+1 records in
4316+1 records out
real31:39.8
user0.0
sys 1.6
