Christian,
The test case for this is to:
- passthrough the NVMe disk to guest;
- and run fio benchmarks against the passed-through NVMe disk in the guest.
I have detailed these steps and pasted the commands in the bug
description. Please let me know if steps are not clear.
The only required HW
Christian,
Using QEMU from comment 6, it improved the performance for numjobs=4 and
numjobs=64 cases, respectively:
READ: bw=1140MiB/s (1195MB/s), 271MiB/s-302MiB/s (284MB/s-317MB/s),
io=66.8GiB (71.7GB), run=60001-60001msec
READ: bw=4271MiB/s (4479MB/s), 30.1MiB/s-82.6MiB/s (31.6MB/s-86.6
Christian,
Patch from comment 8 seems yet another nice improvement. We haven't
tried it to have a strong opinion.
If it's included, then I think patch from comment 9 won't hurt being
added too.
Murilo
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Manoj, Christian,
Please refer to the attached debdiff (it was my first debdiff, so it
might contain errors :)).
Let me know if you need anything else.
Cheers
Murilo
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** Patch added: "debdiff for Xenial qemu"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1723914/+attachment/5099155/+files/debdiff_qemu_xenial.patch
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Pior to commit 8b9f2118ca40b1de72d8f75b59a5fb4d347a69f7 ("ppc64: set
MSR_SF bit"), qemu-system-ppc64 was not setting the 64-bit mode bit in
MSR.
Applying it on top of qemu 2.5 from Ubuntu 16.04.04, makes kvm-unit-
tests happy.
muriloo@jaspion1:~/sources/ubuntu$ dpkg-source -x qemu_2.5+dfsg-5ubunt
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