Date: Wed, 22 Feb 2017 10:23:00 +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-216759-27103-9pCcuqbxxx@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 #6 from Roger Pau Monn=C3=83=C2=A9 <royger@freebsd.org> --- This are the results of the tests on bare-metal using FreeBSD 12 (less than= 1 month old): # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D4G 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: 4096M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 4194304 (1122695.18 ops/sec) 4096.00 MB transferred (1096.38 MB/sec) Test execution summary: total time: 3.7359s total number of events: 4194304 total time taken by event execution: 2.6089 per-request statistics: min: 0.00ms avg: 0.00ms max: 0.22ms approx. 95 percentile: 0.00ms Threads fairness: events (avg/stddev): 4194304.0000/0.00 execution time (avg/stddev): 2.6089/0.00 # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D4G --memory-block-size=3D1M 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: 1024K Memory transfer size: 4096M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 4096 (10462.26 ops/sec) 4096.00 MB transferred (10462.26 MB/sec) Test execution summary: total time: 0.3915s total number of events: 4096 total time taken by event execution: 0.3898 per-request statistics: min: 0.06ms avg: 0.10ms max: 0.17ms approx. 95 percentile: 0.10ms Threads fairness: events (avg/stddev): 4096.0000/0.00 execution time (avg/stddev): 0.3898/0.00 --=20 You are receiving this mail because: You are the assignee for the bug.=
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