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Abnormal RAID0 CPU Usage

post #1 of 11
Thread Starter 
My 2x Raptor RAID0 was using 64K blocks. I was getting 110MB/s to 135MB/s and 3% CPU usage. I rebuilt the array using 16k blocks. I am now getting a very consistent 125MB/s to 139MB/s. However, my CPU usage is a shoking 17-21% !!! I have ran HD Tach multiple times for the same results.

Anyone have any ideas? I know RAID0 with smaller blocks will use more CPU cycles. However, it should not be that much. I am running Vista and a nForce 4 as the RAID controller.
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post #2 of 11
What's your burst speeds -- and did you remember to install the latest drivers?
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by gonX View Post
What's your burst speeds -- and did you remember to install the latest drivers?
Burst was originally around 250MB but dropped to around 170MB. Installed the latest nF4 Vista drivers from www.nvidia.com
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post #4 of 11
Hm, it sounds like Vista is messing up. I think I get 7% on my RAID-0 in the sig in XP (single core)
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by gonX View Post
Hm, it sounds like Vista is messing up. I think I get 7% on my RAID-0 in the sig in XP (single core)
Why now with 16K sectors and not before with 64k sectors?
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post #6 of 11
Thread Starter 
Bump... anyone? If not... my 3rd Vista reinstall in a day..
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post #7 of 11
Thread Starter 
After 4 more reinstalls... I found a very strange bug with nForce RAID. I benchmarked multiple times with both HD Tach and HD Tune.

16K blocks needed 20-22% CPU utilization
32K blocks needed 15-17% CPU utilization
64k blocks needed 2-3% CPU utilization
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post #8 of 11
Smaller block are used for Server type applications or environments while larger block sizes are used for editing/gaming/multimedia etc.

I can only speculate that with the smaller block sizes, the hard drive needs more input from the cpu due to the smaller block size and more strain on the cache.

Do you have DMA enabled?
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by TheLegend View Post
Smaller block are used for Server type applications or environments while larger block sizes are used for editing/gaming/multimedia etc.

I can only speculate that with the smaller block sizes, the hard drive needs more input from the cpu due to the smaller block size and more strain on the cache.

Do you have DMA enabled?
Isn't DMA settings needed for IDE?

Also, Iread above for my results with smaller blocks. My benchmarks average I/O increased and were more constient but lost some burst speed.

Yes, smaller blocks require more CPU processing but 20% is a LOT!
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post #10 of 11
Quote:
Originally Posted by DuckieHo View Post
Isn't DMA settings needed for IDE?

Also, Iread above for my results with smaller blocks. My benchmarks average I/O increased and were more constient but lost some burst speed.

Yes, smaller blocks require more CPU processing but 20% is a LOT!
I'm not quite sure about DMA for both SATA and IDE. I'll have to look into it further, but the correlation makes sense between the benchmarks.

The larger the throughput, the harder the CPU works to produce those results. You would probably notice a smaller amount of CPU usage with a 16mb cache if you own the 8mb versions.
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