From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: kus Kusche Klaus <kus@keba.com>
Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: 2.6.11, IDE: Strange scheduling behaviour: high-pri RT process not scheduled?
Date: Wed, 30 Mar 2005 14:06:37 +0200 [thread overview]
Message-ID: <58cb370e05033004065b14da51@mail.gmail.com> (raw)
In-Reply-To: <AAD6DA242BC63C488511C611BD51F3673231C2@MAILIT.keba.co.at>
On Wed, 30 Mar 2005 13:52:05 +0200, kus Kusche Klaus <kus@keba.com> wrote:
> However, things break seriously when exercising the CF card in parallel
> (e.g. with a dd if=/dev/hda of=/dev/null):
>
> * The rtc *interrupt handler* is delayed for up to 250 *micro*seconds.
> This is very bad for my purpose, but easy to explain: It is roughly the
> time needed to transfer 512 Bytes from a CF card which can transfer 2
> Mbyte/sec, and obviously, the CPU blocks all interrupts while making pio
>
> transfers. (Why? Is this really necessary?)
>
> (I know because I instrumented the rtc irq handler with rdtscl(), too)
hdparm -u1 /dev/hda
should help
next prev parent reply other threads:[~2005-03-30 12:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-30 11:52 2.6.11, IDE: Strange scheduling behaviour: high-pri RT process not scheduled? kus Kusche Klaus
2005-03-30 12:06 ` Bartlomiej Zolnierkiewicz [this message]
2005-03-30 14:41 ` Mark Hahn
2005-03-30 20:37 ` Lee Revell
2005-03-31 11:35 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2005-03-30 12:21 kus Kusche Klaus
2005-03-31 11:05 kus Kusche Klaus
2005-03-31 15:19 kus Kusche Klaus
2005-03-31 15:22 ` Ingo Molnar
2005-04-01 9:07 kus Kusche Klaus
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