From: Stefan Weinhuber <wein@linux.vnet.ibm.com>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Xose Vazquez Perez <xose.vazquez@gmail.com>,
Stefan Weinhuber <wein@de.ibm.com>,
Horst Hummel <Horst.Hummel@de.ibm.com>,
Stefan Haberland <stefan.haberland@de.ibm.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: deadline ALWAYS default for dasd devices(s390) ?
Date: Wed, 05 May 2010 09:52:17 +0200 [thread overview]
Message-ID: <4BE123B1.1050500@linux.vnet.ibm.com> (raw)
In-Reply-To: <20100505061620.GA2381@osiris.boeblingen.de.ibm.com>
Heiko Carstens wrote:
> On Mon, Apr 26, 2010 at 02:34:16PM +0200, Xose Vazquez Perez wrote:
>> hi,
>>
>> why is it FORCED ? bypassing a GLOBAL setting and also the kernel command line !!!
>>
>
> Horst, Stefan W. or Stefan H. should be able to answer your question.
At the time this change was made we had the problem that the
default scheduler chosen by the distributions resulted in
bad performance for DASD devices.
I don't know what options were considered back then, but
I think that having the device driver set a driver specific default
is better than forcing the whole system to use 'our' scheduler.
I agree that hard coding this choice into the driver is not pretty,
but it is pragmatic. Some generic mechanism for setting driver specific
defaults would be nicer, but I doubt that many other drivers would
actually benefit from such an interface.
next prev parent reply other threads:[~2010-05-05 7:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-26 12:34 deadline ALWAYS default for dasd devices(s390) ? Xose Vazquez Perez
2010-05-05 6:16 ` Heiko Carstens
2010-05-05 7:52 ` Stefan Weinhuber [this message]
2010-05-05 7:55 ` Michael Tokarev
2010-05-06 7:34 ` Xose Vazquez Perez
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