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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK2Ky6xjz5htYdYp9rpfWt1fyK+3oc+i1nR9GWh_hyULpZ=QMg@mail.gmail.com>
Date:	Fri, 25 Oct 2013 11:10:22 +0800
From:	韩磊 <bonben1989@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: A thought about IO scheduler in linux kernel for SSD

2013/10/23 Jan Kara <jack@...e.cz>:
> On Wed 23-10-13 08:47:44, 韩磊 wrote:
>> 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.
>
>   That doesn't make much sense to me. If there are two bios in flight for
> some sector, results are undefined. Thus we usually avoid such situation
> (usually we want to have defined contents of the disk :). The exclusion is
> usually achieved at higher level using page locking etc. So adding code
> speeding up such requests doesn't seem worth it.
>
>                                                                 Honza
> --
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR

Do you mean that the probability of two bios have the same start
sector in request list at this level is very low??Discuss with you
is a kind of enjoyment.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/