[Gluster-users] High CPU utilization on Windows Guest OS with random write workload when using Cinder Volume (libgfapi)

[qingwei wei]

Hi,

I realized this happens only when i use libgfapi and there is no such
problem when i use fuse. As libgfapi is started by qemu-kvm, could this be
the reason why CPU utilization is high on Windows guest?

Cw

On Tue, Mar 8, 2016 at 4:38 PM, qingwei wei <tchengwee at gmail.com> wrote:

> Hi all,
>
> I am currently testing running Openstack instance on Cinder volume with
> libgfapi. This instance is the Windows instance and i found that when
> running random 4k write workload, the CPU utilization is very high,  90%
> CPU utilization with about 86% in privileged time. I also tested the
> workload with volume from NFS and the CPU utilization is only around 5%. Is
> there any reason why is that so? Appreciate on any comments and suggestions.
>
> Details.
>
> Workload generator: IOMeter
> Instance: Windows 2008R2
> Openstack Host: CentOS 7
> Workload: 4kb random write, 4 workers with each worker configure to have 4
> outstanding IOs
> Gluster server and client version: 3.7.8
>
> Gluster info
> Volume Name: g37test
> Type: Distribute
> Volume ID: 27947421-111b-4727-bcaf-bafe73debe07
> Status: Started
> Number of Bricks: 1
> Transport-type: tcp
> Bricks:
> Brick1: 192.168.99.4:/mnt/ssd/g37test
> Options Reconfigured:
> performance.readdir-ahead: on
> nfs.disable: true
> performance.io-cache: off
> performance.quick-read: off
> server.allow-insecure: on
> storage.owner-uid: 165
> storage.owner-gid: 165
>
>
> IOmeter result:
>
> Glusterfs
> ======
> IOPS: ~5800
> CPU utilization: ~90%
>
> NFS
> ===
> IOPS: ~6000
> CPU Utilization: ~5-6%
>
>
>
> Cw
>
>
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