From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Helge Deller <deller@gmx.de>
Cc: linux-parisc <linux-parisc@vger.kernel.org>
Subject: Re: Does there exists any 32bit-only PARISC SMP machines?
Date: Fri, 30 Aug 2013 06:42:21 +0400 [thread overview]
Message-ID: <1377830541.2331.5.camel@dabdike> (raw)
In-Reply-To: <521F9848.4010404@gmx.de>
On Thu, 2013-08-29 at 20:51 +0200, Helge Deller wrote:
> Hi all,
>
> I was asked by the debian kernel team to drop on parisc the UP kernels
> and only provide SMP kernels even for UP-machines.
> For 64bit it might make sense to only ship a 64bit SMP kernel, but I'm
> not sure if it makes sense for 32bit kernels.
> One major question would be, if there exists any 32bit parisc machines
> which support multiple CPUs at all?
> If not, then it would make sense to drop the 32bit SMP kernels
> instead.
>
> So, are there any 32bit SMP machines out there?
Yes, the J class systems have some 32 bit only SMP boxes (well one, the
J210XC, I think) ... mostly with 7200 and above processors.
> Any other thoughts on this topic?
SMP will certainly work. The main problem with SMP on UP is the
unnecessary spinlock cost. I think given there's very few owners of J
class SMP 32 bit systems, 32 bit UP and 64 bit SMP is OK.
James
next prev parent reply other threads:[~2013-08-30 2:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-29 18:51 Does there exists any 32bit-only PARISC SMP machines? Helge Deller
2013-08-30 2:42 ` James Bottomley [this message]
2013-09-03 15:56 ` Domenico Andreoli
2013-09-04 8:13 ` Aw: " Helge Deller
2013-09-04 14:07 ` Domenico Andreoli
2013-09-04 14:28 ` Domenico Andreoli
2013-09-04 15:41 ` John David Anglin
2013-09-05 16:24 ` John David Anglin
2013-10-21 20:07 ` HP J5600/J6750 64bit SMP CPU#1 stuck problems [was: Does there exists any 32bit-only PARISC SMP machines?] Helge Deller
2013-10-21 20:37 ` John David Anglin
2013-10-21 20:39 ` Helge Deller
2013-10-26 22:06 ` Helge Deller
2013-10-29 13:31 ` Domenico Andreoli
2013-09-04 8:44 ` Does there exists any 32bit-only PARISC SMP machines? Thomas Bogendoerfer
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