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Message-ID: <a5404b12-b1f1-db87-2836-7974a6878cb3@gmail.com>
Date: Sat, 18 Sep 2021 09:19:11 +0800
From: Wang Jianchao <jianchao.wan9@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: Memcached with cfs quota 400% performance boost after bind to 4
cpus
Hi Peter
The hardware information is as following
On 2021/9/17 8:35 下午, Wang Jianchao wrote:
> Hi list
>
> I have a test environment with following,> A memcached (memcached -d -m 50000 -u root -p 12301 -c 1000000 -t 16) in cpu cgroup with following config,
> cpu.cfs_quota_us = 400000
> cpu.cfs_period_us = 100000
Model name: Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz
Stepping: 7
CPU MHz: 2800.033
CPU max MHz: 3900.0000
CPU min MHz: 1000.0000
BogoMIPS: 4600.00
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 22528K
NUMA node0 CPU(s): 0-15,32-47
NUMA node1 CPU(s): 16-31,48-63
>
> And a mutilate loop (mutilate -s x.x.x.x:12301 -T 40 -c 20 -t 60 -W 5 -q 1000000) running on another host
> w/o any cgroup config,
Model name: Intel(R) Xeon(R) Gold 5218R CPU @ 2.10GHz
Stepping: 7
CPU MHz: 2900.155
CPU max MHz: 4000.0000
CPU min MHz: 800.0000
BogoMIPS: 4200.00
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 28160K
NUMA node0 CPU(s): 0-19,40-59
NUMA node1 CPU(s): 20-39,60-79
The memory on both machine is bigger than 100G and most of them is free.
>
> When bind memcached to 0-15 with cpuset,
> ==========================================
> mutilate showed,
> #type avg std min 5th 10th 90th 95th 99th
> read 1275.8 6358.9 49.8 378.2 418.5 767.2 841.4 53998.5
> update 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
> op_q 1.0 0.0 1.0 1.0 1.0 1.1 1.1 1.1
>
> Total QPS = 626566.2 (37594133 / 60.0s)
>
> Misses = 0 (0.0%)
> Skipped TXs = 0 (0.0%)
>
> RX 9288150851 bytes : 147.6 MB/s
> TX 1353390552 bytes : 21.5 MB/s
>
> And perf on memcached showed,
> 635,602,955,852 cycles (30.07%)
> 479,554,401,177 instructions # 0.75 insn per cycle (40.02%)
> 12,585,059,799 L1-dcache-load-misses # 9.31% of all L1-dcache hits (50.07%)
> 135,140,424,785 L1-dcache-loads (49.96%)
> 76,849,156,759 L1-dcache-stores (50.02%)
> 45,700,267,543 L1-icache-load-misses (49.97%)
> 495,149,862 LLC-load-misses # 24.96% of all LL-cache hits (39.95%)
> 1,984,134,589 LLC-loads (39.97%)
> 327,130,920 LLC-store-misses (20.06%)
> 1,397,111,117 LLC-stores (20.06%)
>
>
> When bind memcached to 0-3 with cpuset,
> ========================================
> mutilate showed,
> #type avg std min 5th 10th 90th 95th 99th
> read 934.7 3669.3 41.1 112.8 129.5 385.3 3321.9 21923.7
> update 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
> op_q 1.0 0.0 1.0 1.0 1.0 1.1 1.1 1.1
>
> Total QPS = 852885.6 (51173140 / 60.0s)
>
> Misses = 0 (0.0%)
> Skipped TXs = 0 (0.0%)
>
> RX 12642165580 bytes : 200.9 MB/s
> TX 1842259932 bytes : 29.3 MB/s
>
> And perf on memcached showed,
>
> 621,311,916,151 cycles (30.01%)
> 599,835,965,997 instructions # 0.97 insn per cycle (40.02%)
> 12,585,889,988 L1-dcache-load-misses # 7.59% of all L1-dcache hits (50.00%)
> 165,750,518,361 L1-dcache-loads (50.01%)
> 93,588,611,989 L1-dcache-stores (50.00%)
> 44,445,213,037 L1-icache-load-misses (50.01%)
> 568,410,466 LLC-load-misses # 26.91% of all LL-cache hits (40.03%)
> 2,112,218,392 LLC-loads (40.00%)
> 261,202,604 LLC-store-misses (19.97%)
> 1,484,886,714 LLC-stores
>
>
> We can see the IPC raised from 0.75 to 0.97, this should be the reason of the performance boost.
> What does cause the IPC boost ?
>
> Thanks a million for any help
> Jianchao
>
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