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-86.6MB/s), io=250GiB (269GB), run=60001-60003msec $ dpkg -l | grep ppa1 ii qemu 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el fast processor emulator ii qemu-block-extra:ppc64el 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el extra block backend modules for qemu-system and qemu-utils ii qemu-kvm 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU Full virtualization on x86 hardware ii qemu-system 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries ii qemu-system-arm 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (arm) ii qemu-system-common 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (common files) ii qemu-system-mips 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (mips) ii qemu-system-misc 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (miscellaneous) ii qemu-system-ppc 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (ppc) ii qemu-system-s390x 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (s390x) ii qemu-system-sparc 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (sparc) ii qemu-system-x86 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU full system emulation binaries (x86) ii qemu-user 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU user mode emulation binaries ii qemu-user-binfmt 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU user mode binfmt registration for qemu-user ii qemu-utils 1:2.11+dfsg-1ubuntu7.20~ppa1 ppc64el QEMU utilities Note 0: We booted a newer kernel on the host that contained the patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a32295c612c57990d17fb0f41e7134394b2f35f6 Using Bionic kernel 4.15.0-65.74, the performance hasn't changed. Most likely because Bionic kernel doesn't contain the above patch yet. Note 1: Kudos to Murilo Vicentini for running the tests and capturing the numbers. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1847948 Title: Improve NVMe guest performance on Bionic QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1847948/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
