linux-kernel - Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable

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Message-ID: <20080823104311.GC25904@elte.hu>
Date:	Sat, 23 Aug 2008 12:43:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Joshua Hoblitt <j_kernel@...litt.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of
	16gb of memory is usable


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Fri, Aug 22, 2008 at 5:22 PM, Joshua Hoblitt <j_kernel@...litt.com> wrote:
> > I've confirmed that the boards in these systems are Tyan Tempest 
> > i5400PW (S5397)s.  We've discovered a workload that will deadlock 
> > the system under both 2.6.24.2 and -tip kernel with the mtrr masking 
> > patch.  The only thing unusual about this workload is that one of 
> > the binaries in it constantly segvs...  Is it possible that these 
> > deadlocks (no kernel oops on console) are caused by MSR setup 
> > wierdness or is it likely unrelated?
> 
> could be other problem.
> 
> cpu should be smarter enough to understand the missing bits in mask. 
> at least amd cpu. remember that we didn't set mask bits to 40bits with 
> opteron with LinuxBIOS, and everything still works well.

yeah. Is the deadlock debuggable? (does nmi_watchdog=1 produce anything 
useful, or does the enabling of CONFIG_PROVE_LOCKING=y show anything 
weird in the syslog during light, non-deadlocking use of this workload?)

	Ingo
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