From: Lee Revell <rlrevell@joe-job.com>
To: "Martin J. Bligh" <mbligh@mbligh.org>
Cc: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Con Kolivas <kernel@kolivas.org>
Subject: Re: 2.6.12-mm1 boot failure on NUMA box.
Date: Sat, 25 Jun 2005 14:08:25 -0400 [thread overview]
Message-ID: <1119722905.5762.15.camel@mindpipe> (raw)
In-Reply-To: <44570000.1119681732@[10.10.2.4]>
On Fri, 2005-06-24 at 23:42 -0700, Martin J. Bligh wrote:
> > (btw., if the TSC is that unreliable on numaq boxes, shouldnt we disable
> > it for userspace apps too? Or are those hangs purely kernel bugs? In
> > which case it might make sense to debug those a bit more - large-scale
> > TSC unsyncedness is something that could slip in on other hardware too.)
>
> Well it reads reliably. it just reliably reads utter random crap (well,
> across CPUs). Not many things read tsc from userspace, and it won't hang
> I guess .... depends what their expecations are. I do like gettimeofday
> not to go backwards though - that tends to bugger things up ;-)
The userspace apps that read the TSC know what they are doing, and have
chosen to use the TSC because they need a cheap, fast timer rather than
a correct one. Please don't break it.
Lee
next prev parent reply other threads:[~2005-06-25 18:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-21 5:07 2.6.12-mm1 boot failure on NUMA box Martin J. Bligh
2005-06-21 6:29 ` Andrew Morton
2005-06-21 14:22 ` Martin J. Bligh
2005-06-21 20:03 ` Andrew Morton
2005-06-24 14:11 ` Martin J. Bligh
2005-06-24 14:14 ` Con Kolivas
2005-06-24 15:31 ` Martin J. Bligh
2005-06-24 17:01 ` Ingo Molnar
2005-06-24 17:09 ` Martin J. Bligh
2005-06-24 19:52 ` Ingo Molnar
2005-06-24 20:08 ` Nish Aravamudan
2005-06-24 20:56 ` Martin J. Bligh
2005-06-25 4:00 ` Ingo Molnar
2005-06-25 6:42 ` Martin J. Bligh
2005-06-25 9:09 ` Ingo Molnar
2005-06-25 18:08 ` Lee Revell [this message]
2005-06-25 21:03 ` Martin J. Bligh
2005-06-25 21:54 ` Lee Revell
2005-06-28 22:09 ` Martin J. Bligh
[not found] <208690000.1119330454@[10.10.2.4].suse.lists.linux.kernel>
2005-06-21 11:31 ` Andi Kleen
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