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SubjectA thought about IO scheduler in linux kernel for SSD
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Nowadays,the IO schedulers in linux kernel have four types:

deadline,noop,Anticiptory and CFQ.CFQ is the default scheduler.But CFQ is

not a good scheduler for SSD,dealine may be a good choice.
When deadline runs,it has a mount of computation about merging and

sorting.Merge has three types: front_merge,no_merge and back_merge.
Why don't have another type: merge based same sector.For example,it have

two bios in a request list,theyboth have the same bi->sector,the bi->size

maybe not equal. Whether can we put the latter bio replace the former?What

do you find that significant?Or the other levels in OS has finished this
function?


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