linux-kernel - A thought about IO scheduler

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Message-ID: <CAK2Ky6w3vNRicKEufoEH+ggy4tPrmXhoh7WZeKmP5DB9z7+W-g@mail.gmail.com>
Date:	Wed, 23 Oct 2013 19:38:32 +0800
From:	韩磊 <bonben1989@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: A thought about IO scheduler

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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