Re: [Qemu-devel] [PATCH v9 0/8] Optimize VMDK I/O by allocating multiple clusters

[Fam Zheng <famz@redhat.com>]

On Mon, 10/09 22:12, Fam Zheng wrote:
> On Mon, 10/09 18:29, Ashijeet Acharya wrote:
> > Optimization test results:
> > 
> > This patch series improves 128 KB sequential write performance to an
> > empty VMDK file by 54%
> > 
> > Benchmark command: ./qemu-img bench -w -c 1024 -s 128K -d 1 -t none -f
> > vmdk test.vmdk
> > 
> > Changes in v9:
> > - rebase the series
> 
> Thanks, looks good to me, applied:
> 
> https://github.com/famz/qemu/tree/staging

Ashijeet: I've been testing my branch and it seems installing Fedora/CentOS to a
VMDK image is broken with your patches applied. Both guest and QEMU are
responsive, but the installing of packages stops to make any progress at some
point:

Installing rootfiles.noarch (317/318)
Installing langpacks-en.noarch (318/318)
Performing post-installation setup tasks
Configuring fedora-release.noarch
Configuring filesystem.x86_64
Configuring GeoIP-GeoLite-data.noarch
Configuring python3.x86_64
Configuring fedora-logos.x86_64
Configuring kernel-core.x86_64

# hang here

Can you reproduce this on your machine?

My command line is something like this:

qemu-system-x86_64 -enable-kvm -cpu host -m 1G -qmp unix:/home/fam/.q/qemu-8DOC9EF4/qmp,server,nowait -name 8DOC9EF4 -netdev user,id=vnet,hostfwd=:0.0.0.0:10022-:22 -device virtio-net-pci,netdev=vnet -drive file=/var/tmp/test2.vmdk,if=none,id=drive-1,cache=none,aio=native -device virtio-blk-pci,drive=drive-1 -cdrom /stor/iso/CentOS-6.9-x86_64-minimal.iso -pidfile /home/fam/.q/qemu-8DOC9EF4/pid

qemu.git master doesn't have this problem. So I'll drop this series from the
pull request until it is resolved.

Fam