linux-kernel - [libata/ahci] 8a4aeec8d2d: +138.4% perf-stat.dTLB-store-misses, +37.2% perf-stat.dTLB-load-misses

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Date:	Mon, 21 Apr 2014 15:29:55 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	lkp@...org, Fengguang Wu <fengguang.wu@...el.com>
Subject: [libata/ahci] 8a4aeec8d2d: +138.4% perf-stat.dTLB-store-misses, +37.2%
 perf-stat.dTLB-load-misses

HI Dan,

we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata for-next
commit 8a4aeec8d2d6a3edeffbdfae451cdf05cbf0fefd ("libata/ahci: accommodate tag ordered controllers")

2cf532f5e67c0cf  8a4aeec8d2d6a3edeffbdfae4
---------------  -------------------------
     88694337 ~39%    +138.4%  2.115e+08 ~46%  TOTAL perf-stat.dTLB-store-misses
       217057 ~ 0%     -31.3%     149221 ~ 3%  TOTAL interrupts.46:PCI-MSI-edge.ahci
    6.995e+08 ~20%     +37.2%  9.598e+08 ~25%  TOTAL perf-stat.dTLB-load-misses
       110302 ~ 0%     -28.9%      78402 ~ 2%  TOTAL interrupts.CAL
    3.168e+08 ~ 9%     +14.5%  3.627e+08 ~10%  TOTAL perf-stat.L1-dcache-prefetches
    2.553e+09 ~12%     +26.5%  3.228e+09 ~11%  TOTAL perf-stat.LLC-loads
    5.815e+08 ~ 6%     +27.3%  7.403e+08 ~11%  TOTAL perf-stat.LLC-stores
    3.662e+09 ~11%     +22.9%  4.501e+09 ~10%  TOTAL perf-stat.L1-dcache-load-misses
    2.155e+10 ~ 1%      +8.3%  2.333e+10 ~ 1%  TOTAL perf-stat.L1-dcache-store-misses
    3.619e+10 ~ 1%      +5.9%  3.832e+10 ~ 2%  TOTAL perf-stat.cache-references
    1.605e+10 ~ 1%      +4.3%  1.674e+10 ~ 1%  TOTAL perf-stat.L1-icache-load-misses
       239691 ~ 7%      -8.4%     219537 ~ 1%  TOTAL interrupts.RES
         3483 ~ 0%      -5.4%       3297 ~ 0%  TOTAL vmstat.system.in
    2.748e+08 ~ 1%      +4.3%  2.865e+08 ~ 0%  TOTAL perf-stat.cache-misses
     98935369 ~ 0%      +4.9%  1.038e+08 ~ 0%  TOTAL perf-stat.LLC-store-misses
          699 ~ 1%      -3.7%        673 ~ 1%  TOTAL iostat.sda.w_await
          698 ~ 1%      -3.7%        672 ~ 1%  TOTAL iostat.sda.await
       203893 ~ 0%      +3.7%     211474 ~ 0%  TOTAL iostat.sda.wkB/s
       203972 ~ 0%      +3.7%     211488 ~ 0%  TOTAL vmstat.io.bo
       618082 ~ 4%      -4.6%     589619 ~ 1%  TOTAL perf-stat.context-switches
    1.432e+12 ~ 1%      +3.0%  1.475e+12 ~ 0%  TOTAL perf-stat.L1-icache-loads
     3.35e+11 ~ 0%      +3.2%  3.456e+11 ~ 0%  TOTAL perf-stat.L1-dcache-stores
    1.486e+12 ~ 0%      +2.8%  1.527e+12 ~ 0%  TOTAL perf-stat.iTLB-loads
    3.006e+11 ~ 0%      +2.6%  3.084e+11 ~ 0%  TOTAL perf-stat.branch-instructions
    1.793e+12 ~ 0%      +2.8%  1.843e+12 ~ 0%  TOTAL perf-stat.cpu-cycles
    3.352e+11 ~ 1%      +2.9%  3.451e+11 ~ 0%  TOTAL perf-stat.dTLB-stores
    2.994e+11 ~ 1%      +3.1%  3.087e+11 ~ 0%  TOTAL perf-stat.branch-loads
     1.49e+12 ~ 0%      +2.9%  1.533e+12 ~ 0%  TOTAL perf-stat.instructions
     5.48e+11 ~ 0%      +2.8%  5.633e+11 ~ 0%  TOTAL perf-stat.dTLB-loads
    2.028e+11 ~ 1%      +2.9%  2.086e+11 ~ 1%  TOTAL perf-stat.bus-cycles
    5.484e+11 ~ 0%      +2.9%  5.644e+11 ~ 0%  TOTAL perf-stat.L1-dcache-loads
    1.829e+12 ~ 0%      +2.7%  1.877e+12 ~ 1%  TOTAL perf-stat.ref-cycles

Legend:
	~XX%    - stddev percent
	[+-]XX% - change percent

Attach full stats changes entries for reference.

Thanks,
Jet





View attachment "reproduce" of type "text/plain" (453 bytes)

View attachment "stats_changes" of type "text/plain" (11813 bytes)