Messages in this thread | | | Date | Wed, 23 Oct 2013 19:38:32 +0800 | Subject | A thought about IO scheduler | From | 韩磊 <> |
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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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