Date: Thu, 23 Feb 2017 20:13:29 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-virtualization@FreeBSD.org Subject: [Bug 216759] [kern] Memory speed with small blocks (1K) up to 35 times slower than host system (under QEMU emulation, but not only) Message-ID: <bug-216759-27103-PQGm9dHrb3@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-216759-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-216759-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216759 --- Comment #7 from andrew@azar-a.net --- Same config VPS on QEMU with CentOS 7 # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D1G run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 1 Doing memory operations speed test Memory block size: 1K Memory transfer size: 1024M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 1048576 (1491466.64 ops/sec) 1024.00 MB transferred (1456.51 MB/sec) Test execution summary: total time: 0.7031s total number of events: 1048576 total time taken by event execution: 0.5486 per-request statistics: min: 0.00ms avg: 0.00ms max: 18.49ms approx. 95 percentile: 0.00ms Threads fairness: events (avg/stddev): 1048576.0000/0.00 execution time (avg/stddev): 0.5486/0.00 The node running it: # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D1G run sysbench 0.4.12: multi-threaded system evaluation benchmark Running the test with following options: Number of threads: 1 Doing memory operations speed test Memory block size: 1K Memory transfer size: 1024M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 1048576 (3862725.85 ops/sec) 1024.00 MB transferred (3772.19 MB/sec) Test execution summary: total time: 0.2715s total number of events: 1048576 total time taken by event execution: 0.2213 per-request statistics: min: 0.00ms avg: 0.00ms max: 0.04ms approx. 95 percentile: 0.00ms Threads fairness: events (avg/stddev): 1048576.0000/0.00 execution time (avg/stddev): 0.2213/0.00 --=20 You are receiving this mail because: You are the assignee for the bug.=
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