[Gluster-devel] High CPU consumption on Windows guest OS when libgfapi is used

[qingwei wei]

Hi Vijay,

I rerun the test with gluster 3.7.11and found that the utilization still
high when i use libgfapi. The write performance is also no good.

Below are the info and results:

Hypervisor host:
libvirt 1.2.17-13.el7_2.4
qemu-kvm 2.1.2-23.el7.1


WIndows VM:
Windows 2008R2
IOmeter

Ubuntu VM:
Ubuntu 14.04
fio 2.1.3


Windows VM (libgfapi)

4k random read

IOPS 22920.76
Avg. response time (ms) 0.65
CPU utilization total (%) 82.02
CPU Privilegde time (%) 77.76
4k random write

IOPS 4526.39
Avg. response time (ms) 3.26
CPU utilization total (%) 93.61
CPU Privilegde time (%) 90.24
Windows VM (fuse)

4k random read

IOPS 14662.86
Avg. response time (ms) 1.08
CPU utilization total (%) 27.66
CPU Privilegde time (%) 24.45
4k random write

IOPS 16911.66
Avg. response time (ms) 0.94
CPU utilization total (%) 26.74
CPU Privilegde time (%) 22.64
Ubuntu VM (libgfapi)

4k random read

IOPS 34364
Avg. response time (ms) 0.46
CPU utilization total (%) 6.09
4k random write

IOPS 4531
Avg. response time (ms) 3.53
CPU utilization total (%) 1.2
Ubuntu VM (fuse)

4k random read

IOPS 17341
Avg. response time (ms) 0.92
CPU utilization total (%) 4.22
4k random write

IOPS 17611
Avg. response time (ms) 0.91
CPU utilization total (%) 4.65
Any comments on this or things i should try?

Thanks.

Cw

On Mon, Apr 18, 2016 at 10:00 PM, Vijay Bellur <vbellur at redhat.com> wrote:

> On 04/18/2016 06:50 AM, qingwei wei wrote:
>
>> Hi,
>>
>> I posted this on gluster-users mailing list but got no response so far.
>>
>> http://www.gluster.org/pipermail/gluster-users/2016-March/025727.html
>>
>> Basically, Windows guest OS CPU consumption is very high when i run some
>> IO workload. This si not happening for NFS or fuse mount gluster volume.
>> Anyone here experience the same also?
>>
>>
> Is a similar behavior being observed with Linux guests too?
>
> I also observe that the setup consists of 3.7.8. I would recommend using
> 3.7.9 or higher as 3.7.8 had a performance regression problem.
>
> Some windows guests also need tuning to keep CPU consumption under
> control. One such article can be found in the proxmox wiki [1].
>
> HTH,
> Vijay
>
> [1] http://pve.proxmox.com/wiki/Performance_Tweaks#Windows
>
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