From: Finn Thain <fthain@telegraphics.com.au>
To: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Kars de Jong <jongk@linux-m68k.org>,
Philip Blundell <philb@gnu.org>,
Andreas Schwab <schwab@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
Stephen N Chivers <schivers@csc.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
John Stultz <john.stultz@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
linux-m68k <linux-m68k@lists.linux-m68k.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH v2 09/14] m68k: hp300: Remove hp300_gettimeoffset()
Date: Sun, 25 Nov 2018 14:25:25 +1100 (AEDT) [thread overview]
Message-ID: <alpine.LNX.2.21.1811251350500.10@nippy.intranet> (raw)
In-Reply-To: <36b78174-5038-a1ac-4c70-d84a34edd275@gmail.com>
On Sun, 25 Nov 2018, Michael Schmitz wrote:
> > We can benchmark gettimeofday syscalls on elgar but is that hardware
> > representative of other relevant models?
>
> I suppose the CIA is on the main board, so running with the slower clock
> speed that you'd see with a vanilla Amiga without 060 accelerator board.
> Ought to be representative enough?
>
Not really. An accelerated CPU clock exaggerates the slowdown factor,
given the fixed 0.7 MHz CIA clock.
The "(ticks > jiffy_ticks / 2)" conditional won't make anything worse even
if interrupt latency is already too high, so I'm inclined towards the more
prudent option. This patch series is already complicated enough.
In anycase, I'd prefer not to speculate about interrupt priorities or
latencies when the list probably has people who know the answers.
--
next prev parent reply other threads:[~2018-11-25 3:25 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-19 1:10 [RFC PATCH v2 00/14] m68k: Drop arch_gettimeoffset and adopt clocksource API Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 09/14] m68k: hp300: Remove hp300_gettimeoffset() Finn Thain
2018-11-20 9:09 ` Kars de Jong
2018-11-20 23:13 ` Finn Thain
2018-11-21 8:10 ` Geert Uytterhoeven
2018-11-21 8:41 ` Finn Thain
2018-11-21 8:55 ` Geert Uytterhoeven
2018-11-21 9:47 ` Finn Thain
2018-11-21 10:02 ` Geert Uytterhoeven
2018-11-21 11:14 ` Finn Thain
2018-11-25 1:15 ` Finn Thain
2018-11-25 2:44 ` Michael Schmitz
2018-11-25 3:25 ` Finn Thain [this message]
2018-11-21 8:22 ` Kars de Jong
2018-11-19 1:10 ` [RFC PATCH v2 07/14] m68k: atari: Convert to clocksource API Finn Thain
2018-11-19 8:35 ` Michael Schmitz
2018-11-20 8:10 ` Linus Walleij
2018-11-20 8:19 ` Geert Uytterhoeven
2018-11-20 9:30 ` Finn Thain
2018-11-20 9:53 ` Linus Walleij
2018-11-20 10:02 ` Andreas Schwab
2018-11-24 2:03 ` Michael Schmitz
2018-11-24 3:08 ` Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 08/14] m68k: bvme6000: " Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 11/14] m68k: mvme147: " Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 10/14] m68k: mac: " Finn Thain
2018-11-20 8:15 ` Linus Walleij
2018-11-20 9:00 ` Finn Thain
2018-11-20 9:59 ` Linus Walleij
2018-11-19 1:10 ` [RFC PATCH v2 04/14] m68k: apollo, q40, sun3, sun3x: Remove arch_gettimeoffset implementations Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 01/14] m68k: Call timer_interrupt() with interrupts disabled Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 03/14] m68k: mac: Clean up unused timer definitions Finn Thain
2018-11-20 1:02 ` Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 12/14] m68k: mvme147: Handle timer counter overflow Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 13/14] m68k: mvme16x: Convert to clocksource API Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 02/14] m68k: mac: Fix VIA timer counter accesses Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 06/14] m68k: amiga: Convert to clocksource API Finn Thain
2018-11-20 8:04 ` Linus Walleij
2018-11-19 1:10 ` [RFC PATCH v2 05/14] m68k: Drop ARCH_USES_GETTIMEOFFSET Finn Thain
2018-11-19 1:10 ` [RFC PATCH v2 14/14] m68k: mvme16x: Handle timer counter overflow Finn Thain
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