Date: Wed, 28 Apr 2021 18:56:30 +0000 From: bugzilla-noreply@freebsd.org To: 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-Hz9Ey0koVn@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 Dimitry Andric <dim@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dim@FreeBSD.org --- Comment #22 from Dimitry Andric <dim@FreeBSD.org> --- With https://reviews.freebsd.org/D29733 applied on top of 13.0-RELEASE, run= ning a FreeBSD guest on Ubuntu 18.04.3 LTS, with qemu-kvm 1:2.11+dfsg-1ubuntu7.1= 9, I see the following difference in sysbench results: --- sysbench-acpi-fast.txt 2021-04-28 20:40:05.529460000 +0200 +++ sysbench-kvmclock.txt 2021-04-28 20:33:52.083953000 +0200 @@ -21,28 +21,28 @@ Done. -Total operations: 524288 (66548.67 per second) +Total operations: 524288 (2142666.15 per second) -512.00 MiB transferred (64.99 MiB/sec) +512.00 MiB transferred (2092.45 MiB/sec) General statistics: - total time: 7.8730s + total time: 0.2397s total number of events: 524288 Latency (ms): min: 0.00 - avg: 0.01 - max: 0.85 - 95th percentile: 0.01 - sum: 2644.91 + avg: 0.00 + max: 0.03 + 95th percentile: 0.00 + sum: 101.93 Threads fairness: events (avg/stddev): 524288.0000/0.00 - execution time (avg/stddev): 2.6449/0.00 + execution time (avg/stddev): 0.1019/0.00 DEBUG: Verbose per-thread statistics: -DEBUG: thread # 0: min: 0.0000s avg: 0.0000s max: 0.0008s events: 524288 -DEBUG: total time taken by event execution: 2.6449s +DEBUG: thread # 0: min: 0.0000s avg: 0.0000s max: 0.0000s events: 524288 +DEBUG: total time taken by event execution: 0.1019s --=20 You are receiving this mail because: You are the assignee for the bug.=
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