From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <9995986211c13fcb763101e66ecd819e@chula.quanstro.net> References: <2c95dd590ea0f02d58b3e10c2b3d7b54@ladd.quanstro.net> <9995986211c13fcb763101e66ecd819e@chula.quanstro.net> From: Venkatesh Srinivas Date: Sat, 29 Jan 2011 05:40:03 -0500 Message-ID: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary=0023547c8feb621d99049af9cf32 Subject: Re: [9fans] Cute plan9/inferno client? Topicbox-Message-UUID: a3b58e16-ead6-11e9-9d60-3106f5b1d025 --0023547c8feb621d99049af9cf32 Content-Type: text/plain; charset=UTF-8 On Fri, Jan 28, 2011 at 4:56 PM, erik quanstrom wrote: > On Fri Jan 28 16:33:03 EST 2011, me@acm.jhu.edu wrote: > > > > > > The Tegra is probably one of the best ARM chips out there... > > > > > > > No it isn't; the Tegra lacks NEON. > > why do you think simd support is key? we have simd on x86 > and ignore it. > - erik > Doesn't matter for Plan 9, its true. I was thinking more generally. For media stuff or signals stuff, NEON is totally key for these ARM widgets, even more than x86en, which can muscle by on OOE and chutzpah. But even disregarding SIMD... the Tegra was based on the ARM11; the ARM11 isn't a terribly competitive core compared to the Cortex A8 in use by many of the ARMed chips; the A8 was a wider (dual-issue) design with a lower-power sleep, bigger/faster cache, and a much better branch predictor. So I'm not sure sure by what metric you'd say "the Tegra is one of the best ARM chips out there...". -- vs --0023547c8feb621d99049af9cf32 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Fri, Jan 28, 2011 at 4:56 PM, erik quanstrom = <quanstro@qua= nstro.net> wrote:
On Fri Jan 28 16:33:03 EST 2011, me@acm.jhu.edu wrote:
> >
> > The Tegra is probably one of the best ARM chips out there...
> >
>
> No it isn't; the Tegra lacks NEON.

why do you think simd support is key? =C2=A0we have simd on x86
and ignore it.
- erik

Doesn't matter for Plan 9, its true. I wa= s thinking more generally. For media stuff or signals stuff, NEON is totall= y key for these ARM widgets, even more than x86en, which can muscle by on O= OE and chutzpah.

But even disregarding SIMD... the Tegra was based on the ARM11; the ARM= 11 isn't a terribly competitive core compared to the Cortex A8 in use b= y many of the ARMed chips; the A8 was a wider (dual-issue) design with a lo= wer-power sleep, bigger/faster cache, and a much better branch predictor. S= o I'm not sure sure by what metric you'd say "the Tegra is one= of the best ARM chips out there...".

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