linux-kernel - Re: x86 perf's dTLB-load-misses broken on IvyBridge? II

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Message-ID: <20140219154036.GX12219@tassilo.jf.intel.com>
Date:	Wed, 19 Feb 2014 07:40:36 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Dave Hansen <dave.hansen@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: x86 perf's dTLB-load-misses broken on IvyBridge? II

> >  [ C(DTLB) ] = {
> >         [ C(OP_READ) ] = {
> >                 [ C(RESULT_ACCESS) ] = 0x81d0, /* MEM_UOP_RETIRED.ALL_LOADS */
> >                 [ C(RESULT_MISS)   ] = 0x0108, /* DTLB_LOAD_MISSES.CAUSES_A_WALK */
> >         },


Actually I tested on the wrong system earlier, sorry The miss event code 
is wrong on IvyBridge, it should be 0x8108 (DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK),
not 0x0108.

BTW that event only counts demand loads, no prefetches, that would be a separate event.

dTLB-loads works with and without PEBS.


-Andi
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