linux-kernel - Re: Dhrystone -- userland version

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Date:   Mon, 9 Jan 2023 20:51:44 +0100
From:   Pavel Machek <pavel@....cz>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Willy Tarreau <w@....eu>, Theodore Ts'o <tytso@....edu>,
        kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>
Subject: Re: Dhrystone -- userland version

Hi!

> >   count=1666675 us50=20178 us250=99913 diff=79735 cpu_MHz=4180.536 tsc50=42614718 tsc250=211016124 diff=101 rdtsc_MHz=2112.014
> >
> > It's also what's used by sbc-bench to verify that CPU vendors are not
> > cheating in the embedded world. It's very simple, and not arch-dependent
> > nor compiler-dependent (at least as long as you don't build at -O0 :-)).
> 
> Seeing the rdtsc stuff, I was a bit skeptical, but it seems to work
> fine on arm32 and rv64.
> 
> Unfortunately you forgot to add a LICENSE file ;-)
> 
> Alternatively, I can use the C version of BogoMIPS.  Which has its
> own merits and reputation.

I'd expect BogoMIPS to be _much_ worse than Dhrystone. If all the
cores are same, it should be good enough, but...

> The nice thing about Dhrystones is that people still publish numbers
> for comparison, also DMIPS/MHz and DMIPS/mW.

...and there seems to be no replacement for that. Dhrystones seem to
become the standard in RISC-V community at least.

Best regards,
								Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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