From: DIXLOR <dixlor@gmail.com>
To: linux-rt-users <linux-rt-users@vger.kernel.org>
Subject: SMP even/odd cores latency
Date: Wed, 3 Feb 2016 22:06:13 +0300 [thread overview]
Message-ID: <56B24FA5.8020706@gmail.com> (raw)
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# ./cyclictest -sm -n -p99 --policy=fifo -S -D60
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 2.89 1.37 0.64 1/506 15232
T: 0 (15179) P:99 I:1000 C: 59999 Min: 14 Act: 56 Avg: 51 Max: 99
T: 1 (15180) P:99 I:1500 C: 39999 Min: 3 Act: 13 Avg: 29 Max: 100
T: 2 (15181) P:99 I:2000 C: 29999 Min: 12 Act: 50 Avg: 48 Max: 101
T: 3 (15182) P:99 I:2500 C: 23999 Min: 4 Act: 13 Avg: 29 Max: 101
T: 4 (15183) P:99 I:3000 C: 19999 Min: 16 Act: 60 Avg: 51 Max: 104
T: 5 (15184) P:99 I:3500 C: 17142 Min: 4 Act: 60 Avg: 30 Max: 102
T: 6 (15185) P:99 I:4000 C: 14999 Min: 14 Act: 29 Avg: 51 Max: 106
T: 7 (15186) P:99 I:4500 C: 13333 Min: 4 Act: 11 Avg: 32 Max: 106
T: 8 (15187) P:99 I:5000 C: 11999 Min: 17 Act: 42 Avg: 47 Max: 90
T: 9 (15188) P:99 I:5500 C: 10908 Min: 5 Act: 40 Avg: 29 Max: 89
T:10 (15189) P:99 I:6000 C: 9999 Min: 18 Act: 43 Avg: 49 Max: 99
T:11 (15190) P:99 I:6500 C: 9230 Min: 5 Act: 28 Avg: 29 Max: 99
T:12 (15191) P:99 I:7000 C: 8571 Min: 14 Act: 56 Avg: 47 Max: 98
T:13 (15192) P:99 I:7500 C: 7999 Min: 5 Act: 11 Avg: 31 Max: 97
T:14 (15193) P:99 I:8000 C: 7499 Min: 16 Act: 64 Avg: 49 Max: 100
T:15 (15194) P:99 I:8500 C: 7058 Min: 5 Act: 42 Avg: 30 Max: 96
Minimum latency on even cores is approximately equal to 15, on the odd - 5
Аverage latency on the even - 50, on the odd cores - 30 :)
- Linux 4.4.1-rt4+ x86_64
- gcc version 4.9.2 (Debian 4.9.2-10)
- 2 x AMD Opteron(tm) Processor 4386
- Mb: TYAN S8225
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next reply other threads:[~2016-02-03 19:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 19:06 DIXLOR [this message]
2016-02-03 19:17 ` SMP even/odd cores latency Staffan Tjernstrom
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