Date: Wed, 22 Feb 2017 09:05:27 +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 Message-ID: <bug-216759-27103-w03LHzlQMX@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 Bartek Rutkowski <robak@freebsd.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |robak@freebsd.org --- Comment #5 from Bartek Rutkowski <robak@freebsd.org> --- Here are some results from the tests on a 12-C vm under XenServer: VM: FreeBSD poudriere 12.0-CURRENT FreeBSD 12.0-CURRENT #3 r314028: Tue Feb= 21 08:07:02 CET 2017=20=20=20=20 root@pd.valinor.palantiri.org:/usr/obj/usr/src/sys/POUDRIERE amd64 XenServer: Linux xenserver 3.10.0+10 #1 SMP Thu Sep 22 12:31:44 UTC 2016 x8= 6_64 x86_64 x86_64 GNU/Linux, Xen version: 4.6.1-xs133690 DD on 8G mdisk: # dd if=3D/dev/zero of=3D/dev/md1 bs=3D1M dd: /dev/md1: end of device 8193+0 records in 8192+0 records out 8589934592 bytes transferred in 15.565112 secs (551871047 bytes/sec) # dd if=3D/dev/zero of=3D/dev/md1 bs=3D1K dd: /dev/md1: end of device 8388609+0 records in 8388608+0 records out 8589934592 bytes transferred in 232.354641 secs (36969068 bytes/sec) Sysbench: # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D8G 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: 8192M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 8388608 (1169942.57 ops/sec) 8192.00 MB transferred (1142.52 MB/sec) Test execution summary: total time: 7.1701s total number of events: 8388608 total time taken by event execution: 5.2679 per-request statistics: min: 0.00ms avg: 0.00ms max: 3.95ms approx. 95 percentile: 0.00ms Threads fairness: events (avg/stddev): 8388608.0000/0.00 execution time (avg/stddev): 5.2679/0.00 # sysbench --num-threads=3D1 --test=3Dmemory --memory-total-size=3D8G --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: 8192M Memory operations type: write Memory scope type: global Threads started! Done. Operations performed: 8192 (46849.56 ops/sec) 8192.00 MB transferred (46849.56 MB/sec) Test execution summary: total time: 0.1749s total number of events: 8192 total time taken by event execution: 0.1727 per-request statistics: min: 0.02ms avg: 0.02ms max: 0.08ms approx. 95 percentile: 0.03ms Threads fairness: events (avg/stddev): 8192.0000/0.00 execution time (avg/stddev): 0.1727/0.00 --=20 You are receiving this mail because: You are the assignee for the bug.=
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