Messages in this thread | | | Date | Wed, 23 Oct 2013 08:47:44 +0800 | Subject | A thought about IO scheduler in linux kernel for SSD | From | 韩磊 <> |
| |
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?
| |