The kernel part of this is in since 4.16 so it either needs a HWE kernel
or to add a kernel Task to backport the related change for the kernel as
well. I'll add a task but it depends the Kernelteam (doability) and the
reporters request (for which kernel it is needed).
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags added: bot-stop-nagging
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https://bugs.launchpad.net/bugs/1847948
Title:
Improve NVMe guest performance on Bionic QEMU
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
Fix Released
Status in qemu package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
New
Status in qemu source package in Bionic:
Triaged
Bug description:
== Comment: #0 - Murilo Opsfelder Araujo - 2019-10-11 14:16:14 ==
---Problem Description---
Back-port the following patches to Bionic QEMU to improve NVMe guest
performance by more than 200%:
?vfio-pci: Allow mmap of MSIX BAR?
https://git.qemu.org/?p=qemu.git;a=commit;h=ae0215b2bb56a9d5321a185dde133bfdd306a4c0
?ppc/spapr, vfio: Turn off MSIX emulation for VFIO devices?
https://git.qemu.org/?p=qemu.git;a=commit;h=fcad0d2121976df4b422b4007a5eb7fcaac01134
---uname output---
na
---Additional Hardware Info---
0030:01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe
SSD Controller 172Xa/172Xb (rev 01)
Machine Type = AC922
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Install or setup a guest image and boot it.
Once guest is running, passthrough the NVMe disk to the guest using
the XML:
host$ cat nvme-disk.xml
<hostdev mode='subsystem' type='pci' managed='no'>
<driver name='vfio'/>
<source>
<address domain='0x0030' bus='0x01' slot='0x00' function='0x0'/>
</source>
</hostdev>
host$ virsh attach-device <domain> nvme-disk.xml --live
On the guest, run fio benchmarks:
guest$ fio --direct=1 --rw=randrw --refill_buffers --norandommap
--randrepeat=0 --ioengine=libaio --bs=4k --rwmixread=100 --iodepth=16
--runtime=60 --name=job1 --filename=/dev/nvme0n1 --numjobs=4
Results are similar with numjobs=4 and numjobs=64, respectively:
READ: bw=385MiB/s (404MB/s), 78.0MiB/s-115MiB/s (81.8MB/s-120MB/s),
io=11.3GiB (12.1GB), run=30001-30001msec
READ: bw=382MiB/s (400MB/s), 2684KiB/s-12.6MiB/s (2749kB/s-13.2MB/s),
io=11.2GiB (12.0GB), run=30001-30009msec
With the two patches applied, performance improved significantly for
numjobs=4 and numjobs=64 cases, respectively:
READ: bw=1191MiB/s (1249MB/s), 285MiB/s-309MiB/s (299MB/s-324MB/s),
io=34.9GiB (37.5GB), run=30001-30001msec
READ: bw=4273MiB/s (4481MB/s), 49.7MiB/s-113MiB/s (52.1MB/s-119MB/s),
io=125GiB (134GB), run=30001-30005msec
Userspace tool common name: qemu
Userspace rpm: qemu
The userspace tool has the following bit modes: 64-bit
Userspace tool obtained from project website: na
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