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Subject: [Bug 216759] [qemu] Memory speed significantly slower under QEMUKVM
 emulation according to sysbench
Date: Sat, 04 Feb 2017 14:12:26 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216759

--- Comment #1 from andrew@azar-a.net ---
Memory disks show writes are perfectly fine.

KVM:

# mdconfig -a -t swap -s 128m -u 1
# dd if=3D/dev/urandom of=3D/root/test bs=3D1M count=3D128
# dd if=3D/root/test of=3D/dev/md1 bs=3D1M
128+0 records in
128+0 records out
134217728 bytes transferred in 0.089190 secs (1504858419 bytes/sec)
# dd if=3D/root/test of=3D/dev/md1 bs=3D1M
128+0 records in
128+0 records out
134217728 bytes transferred in 0.056503 secs (2375411572 bytes/sec)

So seems some specific sysbench call ruins everything. Should we add
[benchmarks/sysbench] ?

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