From: Lee Revell <rlrevell@joe-job.com>
To: Con Kolivas <kernel@kolivas.org>
Cc: linux-kernel@vger.kernel.org, Jens Axboe <axboe@suse.de>,
ck list <ck@vds.kolivas.org>
Subject: Re: [patch] cfq: ioprio inherit rt class
Date: Sat, 03 Jun 2006 13:40:28 -0400 [thread overview]
Message-ID: <1149356428.28744.27.camel@mindpipe> (raw)
In-Reply-To: <200606031010.08794.kernel@kolivas.org>
On Sat, 2006-06-03 at 10:10 +1000, Con Kolivas wrote:
> On Saturday 03 June 2006 03:12, Jens Axboe wrote:
> > Not sure. RT io needs to be considered carefully, but I guess so does RT
> > CPU scheduling. For now I'd prefer to play it a little safer, and only
> > inheric the priority value and not the class.
>
> The problem I envisioned with that was that realtime tasks, if they don't
> specify an io priority (as most current code doesn't), would basically get io
> priority 4 and have the same proportion as any nice 0 SCHED_NORMAL task
> whereas -nice tasks automatically are getting better io priority. How about
> givent them normal class but best priority so they are at least getting the
> same as nice -20?
>
Con,
Have you seen RT threads trying to disk IO 'in the wild' or is this a
theoretical concern? I don't know of any such apps.
Lee
next prev parent reply other threads:[~2006-06-03 17:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-27 1:50 Con Kolivas
2006-05-27 2:08 ` Con Kolivas
2006-06-02 17:12 ` [ck] " Jens Axboe
2006-06-03 0:10 ` Con Kolivas
2006-06-03 17:40 ` Lee Revell [this message]
2006-06-03 18:52 ` Horst von Brand
2006-06-04 1:37 ` Con Kolivas
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