linux-kernel - Re: [PATCH 3/5] perf, x86: Disable PEBS on clowertown chips

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1267823134.4997.5.camel@laptop>
Date:	Fri, 05 Mar 2010 22:05:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	robert.richter@....com, fweisbec@...il.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH 3/5] perf, x86: Disable PEBS on clowertown chips

On Fri, 2010-03-05 at 20:15 +0100, Peter Zijlstra wrote:
> On Fri, 2010-03-05 at 10:58 -0800, Stephane Eranian wrote:
> > >        case 15: /* original 65 nm celeron/pentium/core2/xeon, "Merom"/"Conroe" */
> > > +               x86_pmu.quirks = intel_clowertown_quirks;
> > 
> > That's too coarse grain!
> > It is more subtle than this. Some of the errata are marked as Plan
> > fix. They seem to be
> > fixed in later models. Your looking at the E5xxx series errata but the
> > E7xxx do not have
> > the same problems. 
> 
> OK, I'll look at those errata again and try to come up with a stepping
> test for this errata. 

The two serious ones, AJ106 and AJ68 are no fix and are listed as such
in all errata I can find, including the 7[23]00 series.

I checked the 65nm Core2Duo, Xeon 5200 and Xeon 7[23]00 spec updates.
Going by that it seems the full model 15 family is broken and I'll leave
the patch as is.



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/