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Date: Thu, 16 Jan 2014 09:35:08 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Alex Shi <alex.shi@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ux.intel.com
Subject: [sched] b75e43bb77d: +87% hackbench.throughput
Alex,
We noticed that commit b75e43bb77d ("sched: find the latest idle cpu")
increased hackbench throughput by +87% in test case hackbench
1600%-threads-pipe on a 2S SNB server.
v3.13-rc7 b75e43bb77df14e2209532c1e
--------------- -------------------------
171792 ~ 0% +87.0% 321176 ~ 0% hackbench.throughput
4677274 ~29% +706.1% 37705344 ~ 1% proc-vmstat.pgalloc_dma32
12718244 ~34% +700.6% 1.018e+08 ~ 3% numa-vmstat.node0.numa_local
12741758 ~34% +699.3% 1.019e+08 ~ 3% numa-vmstat.node0.numa_hit
275020 ~16% +535.4% 1747494 ~ 3% proc-vmstat.nr_tlb_remote_flush_received
24343551 ~30% +745.7% 2.059e+08 ~ 1% numa-numastat.node0.local_node
578758 ~13% +507.2% 3514489 ~ 2% interrupts.TLB
8.696e+08 ~ 1% -85.7% 1.246e+08 ~11% interrupts.RES
24343552 ~30% +745.7% 2.059e+08 ~ 1% numa-numastat.node0.numa_hit
24275 ~12% +296.2% 96175 ~ 4% proc-vmstat.nr_tlb_remote_flush
16816 ~ 1% -60.8% 6596 ~ 3% proc-vmstat.nr_tlb_local_flush_all
1.807e+08 ~ 1% +135.8% 4.26e+08 ~ 1% proc-vmstat.numa_local
1.807e+08 ~ 1% +135.8% 4.26e+08 ~ 1% proc-vmstat.numa_hit
1.818e+08 ~ 1% +135.4% 4.28e+08 ~ 1% proc-vmstat.pgfree
1.771e+08 ~ 1% +120.3% 3.903e+08 ~ 1% proc-vmstat.pgalloc_normal
270 ~14% +149.1% 673 ~ 5% slabinfo.mnt_cache.active_objs
270 ~14% +149.1% 673 ~ 5% slabinfo.mnt_cache.num_objs
378 ~ 2% -45.5% 206 ~ 5% proc-vmstat.nr_dirtied
1284432 ~ 2% -42.0% 744640 ~ 2% softirqs.RCU
4821300 ~ 1% -40.6% 2863710 ~ 1% proc-vmstat.pgfault
1.564e+08 ~ 4% +40.8% 2.202e+08 ~ 1% numa-numastat.node1.local_node
1.564e+08 ~ 4% +40.8% 2.202e+08 ~ 1% numa-numastat.node1.numa_hit
78523323 ~ 5% +39.2% 1.093e+08 ~ 3% numa-vmstat.node1.numa_local
78615652 ~ 5% +39.2% 1.094e+08 ~ 3% numa-vmstat.node1.numa_hit
7878 ~ 0% +16.4% 9168 ~ 1% vmstat.procs.r
1413677 ~ 0% -84.6% 218164 ~10% vmstat.system.in
2.386e+09 ~ 0% -76.1% 5.709e+08 ~ 6% time.voluntary_context_switches
5575434 ~ 0% -75.6% 1359735 ~ 5% vmstat.system.cs
9.359e+08 ~ 1% -73.2% 2.508e+08 ~ 6% time.involuntary_context_switches
1229364 ~ 1% +76.9% 2174598 ~ 0% time.minor_page_faults
1638 ~ 1% +60.0% 2622 ~ 1% time.user_time
17188 ~ 0% -8.4% 15749 ~ 0% time.system_time
hackbench.throughput
340000 ++----------------------------------------------------------------+
| O O O O O O O O O O |
320000 ++ O O |
300000 ++ |
| |
280000 ++ |
260000 O+ O O O O |
| |
240000 ++ |
220000 ++ |
| |
200000 ++ |
180000 ++ |
*...*...*...*...*..*...*...*...*...*...*...*...*..*...*...*...*...*
160000 ++----------------------------------------------------------------+
time.involuntary_context_switches
1e+09 ++-----------------------------------------------------------------+
*...*...*...*... ..*...*...*..*... ..*... |
9e+08 ++ *...*. *...*...*...*...*. *...*
8e+08 ++ |
| |
7e+08 ++ |
| |
6e+08 ++ |
| |
5e+08 ++ |
4e+08 ++ |
| |
3e+08 ++ |
O O O O O O O O O O O O O O O O O |
2e+08 ++-----------------------------------------------------------------+
Thanks,
Fengguang
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