From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>, Josh Boyer <jwboyer@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Hemminger <shemminger@vyatta.com>,
Len Brown <len.brown@intel.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH] floppy: revert floppy disable halt warning
Date: Wed, 28 Mar 2012 11:46:27 +0100 [thread overview]
Message-ID: <20120328114627.51b64541@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <4F72BBCE.1060307@zytor.com>
On Wed, 28 Mar 2012 00:20:46 -0700
"H. Peter Anvin" <hpa@zytor.com> wrote:
> On 03/27/2012 11:40 PM, Ingo Molnar wrote:
> >
> > No objections from me.
> >
> > Please resubmit against latest -tip, we unified the idle
> > routines which likely interacts with that patch.
> >
>
> To the best of my knowledge, no-hlt only existed because of flaky power
> distributions on 386/486 systems which were sold to run DOS. Since DOS
> did no power management of any kind, including HLT, the power draw was
> fairly uniform; when exposed to the much higher noise levels you got
> when Linux used HLT caused some of these systems to fail.
Also for the Cyrix 5510 which tended to go castors up if a HLT occurred
during a DMA cycle and on a few other boxes HLT during DMA tended to go
astray.
Do we care ? I doubt it. The 5510 was pretty obscure, the 5520 fixed it,
the 5530 is probably the oldest still in any kind of use.
Alan
prev parent reply other threads:[~2012-03-28 10:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-11 16:38 [PATCH] floppy: revert floppy disable halt warning Stephen Hemminger
2012-03-27 23:26 ` Andrew Morton
2012-03-28 0:24 ` Josh Boyer
2012-03-28 6:40 ` Ingo Molnar
2012-03-28 7:20 ` H. Peter Anvin
2012-03-28 7:34 ` Ingo Molnar
2012-03-28 10:46 ` Alan Cox [this message]
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