Does commit interval inExt3/Ext4 really influence performance?

[Gmail School]

As title, when we change the commit interval from default value, i.e., 5sec, to other large value, for example, 100 sec., etc.

Does it really make the performance higher?

Since I change this value to some large value, running some benchmark(postmark, iozone, bonnie++) to observe it, I didn't find any different between various commit interval value...

Can anyone solve this problem for me?

Thank you very much...--
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