From: "Jeffrey E. Hundstad" <jeffrey.hundstad@mnsu.edu>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: Jan Engelhardt <jengelh@computergmbh.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Disk schedulers
Date: Fri, 15 Feb 2008 10:22:13 -0600 [thread overview]
Message-ID: <47B5BC35.1000700@mnsu.edu> (raw)
In-Reply-To: <20080215155922.GD4269@ics.muni.cz>
Lukas Hejtmanek,
I have to say, that I've heard this subject before, the summary answer
seems to be, that the kernel can not guess the wishes of the user 100%
of the time. If you have a low priority I/O task use ionice(1) to set
the priority of that task so it doesn't nuke your high priority task.
I have to personal stake in this answer but I can report that for my
high I/O tasks it does work like a charm.
--
Jeffrey Hundstad
Lukas Hejtmanek wrote:
> On Fri, Feb 15, 2008 at 03:42:58PM +0100, Jan Engelhardt wrote:
>
>> Also consider
>> - DMA (e.g. only UDMA2 selected)
>> - aging disk
>>
>
> it's not the case.
>
> hdparm reports udma5 is used, if it is reliable with libata.
>
> The disk is 3 months old, kernel does not report any errors. And it has never
> been different.
>
> --
> Lukáš Hejtmánek
> --
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next prev parent reply other threads:[~2008-02-15 16:50 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-14 16:21 Disk schedulers Lukas Hejtmanek
2008-02-15 0:02 ` Tejun Heo
2008-02-15 10:09 ` Lukas Hejtmanek
2008-02-15 14:42 ` Jan Engelhardt
2008-02-15 14:57 ` Prakash Punnoor
2008-02-15 17:11 ` Zan Lynx
2008-02-15 21:32 ` FD Cami
2008-02-16 16:13 ` Lukas Hejtmanek
2008-02-20 17:04 ` Zdenek Kabelac
2008-02-15 15:59 ` Lukas Hejtmanek
2008-02-15 16:22 ` Jeffrey E. Hundstad [this message]
2008-02-15 17:36 ` Roger Heflin
2008-02-15 17:24 ` Paulo Marques
2008-02-16 16:15 ` Lukas Hejtmanek
2008-02-16 17:20 ` Pavel Machek
2008-02-20 18:48 ` Lukas Hejtmanek
2008-02-21 23:50 ` Giuliano Pochini
2008-02-17 19:38 ` Linda Walsh
2008-02-28 17:14 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2011-02-04 12:30 Paresh Nakhe
2011-02-04 15:11 ` Pasi Kärkkäinen
2011-02-04 15:34 ` Paresh Nakhe
2011-02-04 15:51 ` Ian Campbell
2011-02-04 16:23 ` Paresh Nakhe
2011-02-04 16:28 ` Ian Campbell
2011-02-04 16:44 ` Paresh Nakhe
2011-02-04 17:30 ` Ian Campbell
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