Re: [RFC PATCH v2 09/14] m68k: hp300: Remove hp300_gettimeoffset()

From: Michael Schmitz
Date: Sat Nov 24 2018 - 21:45:26 EST


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