From: David Laight <David.Laight@ACULAB.COM>
To: 'Yury Norov' <yury.norov@gmail.com>,
"Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Dennis Zhou <dennis@kernel.org>,
Guenter Roeck <linux@roeck-us.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
"linux-m68k@lists.linux-m68k.org"
<linux-m68k@lists.linux-m68k.org>
Subject: RE: Linux 5.19-rc8
Date: Wed, 27 Jul 2022 07:46:43 +0000 [thread overview]
Message-ID: <2750dc08eb6c4e6dbbd638310f903bce@AcuMS.aculab.com> (raw)
In-Reply-To: <CAAH8bW-BNfhuXF_2cO+x2Qc51G-DFskFmKw8hzDHhC+3Rn1ZUA@mail.gmail.com>
From: Yury Norov
> Sent: 27 July 2022 02:34
...
> If the difference really concerns you, I'd suggest running the test
> several times to measure confidence intervals.
Or, do what I've been doing and get an accurate cycle count
for a single call and repeat about 10 times.
The first value is typically slow (loading I$), the
rest typically identical.
They can often even be matched to the expected value!
The fastest value is the one to quote!
On x86 you have to use the perf cycle counter, the tsc
is just useless.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2022-07-27 7:46 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-24 20:42 Linux 5.19-rc8 Linus Torvalds
2022-07-25 16:11 ` Guenter Roeck
2022-07-25 17:55 ` Linus Torvalds
2022-07-25 18:49 ` Linus Torvalds
2022-07-25 20:35 ` Yury Norov
2022-07-25 20:40 ` Linus Torvalds
2022-07-26 15:51 ` Yury Norov
2022-07-25 19:41 ` Yury Norov
2022-07-26 9:12 ` Russell King (Oracle)
2022-07-26 15:35 ` Yury Norov
2022-07-28 18:28 ` Russell King (Oracle)
2022-07-29 0:11 ` Guenter Roeck
2022-07-26 17:39 ` Dennis Zhou
2022-07-26 17:51 ` Linus Torvalds
2022-07-26 18:18 ` Yury Norov
2022-07-26 18:36 ` Linus Torvalds
2022-07-26 19:44 ` Russell King (Oracle)
2022-07-26 20:20 ` Linus Torvalds
2022-07-27 0:15 ` Russell King (Oracle)
2022-07-27 1:33 ` Yury Norov
2022-07-27 7:43 ` Russell King (Oracle)
2022-07-30 21:38 ` Yury Norov
2022-08-01 15:48 ` Russell King (Oracle)
2022-08-01 15:54 ` Russell King (Oracle)
2022-07-27 7:46 ` David Laight [this message]
2022-07-25 20:34 ` Build regressions/improvements in v5.19-rc8 Geert Uytterhoeven
2022-07-25 20:39 ` Geert Uytterhoeven
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