linux-kernel - A thought about IO scheduler in linux kernel for SSD

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Message-ID: <CAK2Ky6xH9rvmpqQ31bi1QrC=dvt9T_8+ELHUZf_MFZccV6MiAw@mail.gmail.com>
Date:	Wed, 23 Oct 2013 08:47:44 +0800
From:	韩磊 <bonben1989@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: A thought about IO scheduler in linux kernel for SSD

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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