From: Brad Boyer <flar@allandria.com>
To: Finn Thain <fthain@telegraphics.com.au>
Cc: Arnd Bergmann <arnd@kernel.org>,
"Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"arnd@arndb.de" <arnd@arndb.de>,
"geert@linux-m68k.org" <geert@linux-m68k.org>,
"funaho@jurai.org" <funaho@jurai.org>,
"philb@gnu.org" <philb@gnu.org>,
"corbet@lwn.net" <corbet@lwn.net>,
"mingo@redhat.com" <mingo@redhat.com>,
"linux-m68k@lists.linux-m68k.org"
<linux-m68k@lists.linux-m68k.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] IRQ handlers run with some high-priority interrupts(not NMI) enabled on some platform
Date: Fri, 19 Feb 2021 23:08:08 -0800 [thread overview]
Message-ID: <20210220070808.GA7874@allandria.com> (raw)
In-Reply-To: <264b37c2-527-f0ed-197d-b016a7d16e32@telegraphics.com.au>
On Sat, Feb 20, 2021 at 05:32:30PM +1100, Finn Thain wrote:
> Nope. Interrupt priority masking is there to place an upper bound
> interrupt latency. That's why this feature is shipping in contemporary
> hardware (e.g. ARM GIC). If you care about real time workloads on arm64,
> that may interest you.
I don't know if it's still true today, but in the past there was a very
noticeable difference in timer stability between the 68k macintosh
models with the timer interrupt at IPL 1 as compared to the models
where the timer interrupt was at IPL 6. The ability to preempt the
other interrupt handlers made the difference between a usable clock
and one that was pretty unreliable.
Brad Boyer
flar@allandria.com
prev parent reply other threads:[~2021-02-20 7:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-12 1:18 [RFC] IRQ handlers run with some high-priority interrupts(not NMI) enabled on some platform Song Bao Hua (Barry Song)
2021-02-12 22:34 ` Arnd Bergmann
2021-02-12 23:00 ` Song Bao Hua (Barry Song)
2021-02-12 23:05 ` Arnd Bergmann
2021-02-12 23:46 ` Song Bao Hua (Barry Song)
2021-02-13 16:32 ` Arnd Bergmann
2021-02-13 22:18 ` Song Bao Hua (Barry Song)
2021-02-13 23:18 ` Song Bao Hua (Barry Song)
2021-02-14 5:10 ` Finn Thain
2021-02-15 13:06 ` Andy Shevchenko
2021-02-15 22:22 ` Finn Thain
2021-02-17 22:41 ` Song Bao Hua (Barry Song)
2021-02-18 5:30 ` Finn Thain
2021-02-18 11:19 ` Arnd Bergmann
2021-02-18 12:30 ` Geert Uytterhoeven
2021-02-18 13:59 ` Arnd Bergmann
2021-02-18 15:38 ` Geert Uytterhoeven
2021-02-18 22:11 ` Michael Schmitz
2021-02-19 8:10 ` Geert Uytterhoeven
2021-02-19 22:30 ` Brad Boyer
2021-02-20 6:32 ` Finn Thain
2021-02-20 7:08 ` Brad Boyer [this message]
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