Comment 227 for bug 620074
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#227 |
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a60fb26
(Get the code!)
There's still some confusing comments on IO wait in here, lets clear that up at least. 91% io wait does not mean it's using 91% cpu power for doing the IO, it merely means that some process is BLOCKED waiting for IO 91% of the time. It has zero relevance on cpu cycles consumed. Same goes for the observed load. Having a load of 2.0 due to io wait times does not mean that you have a doubly loaded system. It just means that, on average, two processes are blocked waiting for IO. When you start a bittorrent client and it checks the file data, you would expect io wait to be nearly 100%. It does do some cpu processing, so that's why it's not completely at 100%.
So forget IO wait, it doesn't tell you ANYTHING about whether a system is supposed to be slow or not.