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From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Ethan Weinstein <lists@stinkfoot.org>, <linux-kernel@vger.kernel.org>
Subject: Re: HT apparently not detected properly on 2.4.23
Date: Fri, 5 Dec 2003 15:12:14 -0200 (BRST)	[thread overview]
Message-ID: <Pine.LNX.4.44.0312051511440.5412-100000@logos.cnet> (raw)
In-Reply-To: <20031203235837.GW8039@holomorphy.com>



On Wed, 3 Dec 2003, William Lee Irwin III wrote:

> William Lee Irwin III wrote:
> >>You probably have sparse physical APIC ID's.
> 
> On Wed, Dec 03, 2003 at 06:41:36PM -0500, Ethan Weinstein wrote:
> > Ok, setting CONFIG_NR_CPUS=8 does indeed solve the HT issue, looks like 
> > it was the numbering scheme:
> 
> It's easy to fix this; just terminate the loop when the count of cpus
> kicked hits NR_CPUS or the bit would overflow the map instead of the bit
> hitting NR_CPUS. Compare smpboot.c in 2.4 vs. 2.6. No need for the extra
> CONFIG_NR_CPUS bloat.
> 
> 
> On Wed, Dec 03, 2003 at 06:41:36PM -0500, Ethan Weinstein wrote:
> > But we're still only interrupting on CPU0 with this kernel.
> 
> That's P-IV retardation. Not really fixable, but irqbalance daemons
> etc. can help mitigate the severity of the erratum. I'm not sure if
> 2.4 has the interfaces for the userspace solutions to work or the
> kernel solutions either.

I think I will just remove CONFIG_NR_CPUS instead... it seems to bring 
more trouble than advantages. 


  parent reply	other threads:[~2003-12-05 17:44 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-03 18:46 Ethan Weinstein
2003-12-03 19:40 ` Andre Tomt
2003-12-03 19:56   ` Mike Fedyk
2003-12-03 20:30     ` Ethan Weinstein
2003-12-03 22:40 ` William Lee Irwin III
2003-12-03 23:41   ` Ethan Weinstein
2003-12-03 23:58     ` William Lee Irwin III
2003-12-04  0:18       ` Ethan Weinstein
2003-12-05 17:12       ` Marcelo Tosatti [this message]
2003-12-05 17:48         ` William Lee Irwin III
2003-12-05 18:07           ` Re[2]: " Russell "Elik" Rademacher
     [not found]             ` <3FD0CD65.5080307@stinkfoot.org>
2003-12-05 23:02               ` Russell "Elik" Rademacher
2003-12-05 23:28                 ` Ethan Weinstein
2003-12-05 23:31                   ` Re[2]: " Russell "Elik" Rademacher
2003-12-05 23:38                     ` William Lee Irwin III
2003-12-04  0:46     ` William Lee Irwin III

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