linux-kernel - Re: [RFC PATCH v2 09/14] m68k: hp300: Remove hp300

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Message-ID: <36b78174-5038-a1ac-4c70-d84a34edd275@gmail.com>
Date:   Sun, 25 Nov 2018 15:44:33 +1300
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Finn Thain <fthain@...egraphics.com.au>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Kars de Jong <jongk@...ux-m68k.org>,
        Philip Blundell <philb@....org>,
        Andreas Schwab <schwab@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen N Chivers <schivers@....com.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 09/14] m68k: hp300: Remove hp300_gettimeoffset()

Hi Finn,

Am 25.11.2018 um 14:15 schrieb Finn Thain:
> Maybe the timer interrupt has a sufficiently high priority and latency is
> low? Maybe cia_set_irq() is really expensive?
>
> I don't know the platform well enough so I'm inclined to revert. 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?

Adrian has a few other Amigas with different hardware base, so we might 
be able to get test coverage on more than one model.

Cheers,

	Michael


> [1]
> https://github.com/mamedev/mame/commit/e2ed0490520f538c346c8bdaa9084bcbc43427cb
>
> [2]
> http://vice-emu.sourceforge.net/vice_9.html
>
> [3]
> https://www.commodore.ca/manuals/funet/cbm/documents/chipdata/cia6526.zip
>