Hi Stefan, thanks for reply. Unfortunately it didn't work.
disk config: <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='directsync' io='native' discard='unmap'/> <auth username='compute'> <secret type='ceph' uuid='a5d0dd94-57c4-ae55-ffe0-7e3732a24455'/> </auth> <source protocol='rbd' name='volumes-nvme/volume-ce247187-a625-49f1-bacd-fc03df215395'> <host name='172.31.0.1' port='6789'/> <host name='172.31.0.2' port='6789'/> <host name='172.31.0.3' port='6789'/> </source> <target dev='sdb' bus='scsi'/> <serial>ce247187-a625-49f1-bacd-fc03df215395</serial> <address type='drive' controller='0' bus='0' target='0' unit='2'/> </disk> Controller config: <controller type='scsi' index='0' model='virtio-scsi'> <driver queues='8'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> benchmark command: fio --randrepeat=1 --ioengine=libaio --direct=1 --name=test --filename=test --bs=4k --iodepth=64 --size=1G --readwrite=randwrite --time_based --runtime=60 --write_iops_log=write_results --numjobs=8 And I'm still getting very low random write IOPS inside KVM instance with 8vcores(3-5k compared to 20k+ outside KVM) Maybe do You have any idea how to deal with it? wt., 26 cze 2018 o 09:37 Stefan Kooman <ste...@bit.nl> napisał(a): > Quoting Damian Dabrowski (scoot...@gmail.com): > > Hello, > > > > When I mount rbd image with -o queue_depth=1024 I can see much > improvement, > > generally on writes(random write improvement from 3k IOPS on standard > > queue_depth to 24k IOPS on queue_depth=1024). > > > > But is there any way to attach rbd disk to KVM instance with custom > > queue_depth? I can't find any information about it. > > Not specifically "queue depth", but if you use virtio-scsi, and have a > VM with more than 1 vCPU, you can give each vCPU it's own queue [1]: > > <controller type='scsi' index='0' model='virtio-scsi'> > <driver queues='N' /> > </controller> > > > Gr. Stefan > > [1]: > https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/sect-virtualization_tuning_optimization_guide-blockio-techniques > > > -- > | BIT BV http://www.bit.nl/ Kamer van Koophandel 09090351 > | GPG: 0xD14839C6 +31 318 648 688 / i...@bit.nl >
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