From: Keith Owens <kaos@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] Re: strange performance behaviour with floats
Date: Mon, 24 Feb 2003 02:01:10 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805912@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709805910@msgid-missing>
On Sun, 23 Feb 2003 17:50:41 -0800,
David Mosberger <davidm@napali.hpl.hp.com> wrote:
>>>>>> On Mon, 24 Feb 2003 12:45:10 +1100, Keith Owens <kaos@sgi.com> said:
>
> Keith> generated a two bundle loop as you suggested, but BogoMIPS went down,
> Keith> not up.
>
>Note: 2 bundle != 2 cycle, but even ignoring that: what did you
>expect? BogoMIPS counts 2 instructions per loop iteration no matter
>how many instructions are being executed. Perhaps you can get the
>compiler to unroll the loop. Then you'd see a higher BogoMIPS.
Which loop needs unrolling? __delay generates
2d0: 11 00 00 00 01 00 [MIB] nop.m 0x0
2d6: 00 70 04 55 00 00 mov.i ar.lc=r14
2dc: 00 00 00 20 nop.b 0x0;;
2e0: 11 00 00 00 01 00 [MIB] nop.m 0x0
2e6: 00 00 00 02 00 a0 nop.i 0x0
2ec: 00 00 00 40 br.cloop.sptk.few 2e0 <calibrate_delay+0x100>;;
br.cloop is already a single bundle loop.
next prev parent reply other threads:[~2003-02-24 2:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-24 1:45 [Linux-ia64] Re: strange performance behaviour with floats Keith Owens
2003-02-24 1:50 ` David Mosberger
2003-02-24 2:01 ` Keith Owens [this message]
2003-02-24 2:16 ` David Mosberger
2003-02-24 2:25 ` Keith Owens
2003-02-24 19:12 ` David Mosberger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=marc-linux-ia64-105590709805912@msgid-missing \
--to=kaos@sgi.com \
--cc=linux-ia64@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox