Messages in this thread | | | Date | Fri, 25 Mar 2011 19:33:11 -0400 | Subject | Ext3: Why journal is better than ordered when data needs to be read from and written to disk at the same time | From | Jidong Xiao <> |
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Hi,
I see many literatures mentioned this, but I have never seen any one explains it in detail.(Although this link exposed the original story: http://lkml.indiana.edu/hypermail//linux/kernel/0107.1/0364.html)
"Journal mode: This mode is the slowest except when data needs to be read from and written to disk at the same time where it outperform all others mode."
Since this is counter-intuitive, I believe many people are not aware about the root cause. Can any one kindly explain it so as to make it more clear? Thank you!
Regards Jidong
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