[Gluster-users] Gluster write speed depends on bs

[Johan Huysmans]

I created a bug for this problem:
https://bugzilla.redhat.com/show_bug.cgi?id=1054133

On 16-01-14 09:24, Johan Huysmans wrote:
>
> I'm performing some speed tests on my simple gluster setup.
> There is only 1 node and the mountpoint uses the glusterfs daemon.
>
> # gluster volume info
> Volume Name: testvolume
> Type: Distribute
> Volume ID: 9476ee38-33d3-4e98-9649-2e150b92d26e
> Status: Started
> Number of Bricks: 1
> Transport-type: tcp
> Bricks:
> Brick1: SRV-1:/gluster/brick1
> Options Reconfigured:
> network.ping-timeout: 5
> performance.stat-prefetch: off
>
>
> # mount | grep gluster
> /dev/mapper/systemvg-gluster on /gluster type xfs (rw)
> localhost:/testvolume on /mnt/sharedfs type fuse.glusterfs 
> (rw,default_permissions,allow_other,max_read=131072)
>
> When I perform writes to the /gluster directory (this is the xfs 
> partition where the brick is located) I get these speeds:
> # dd if=/dev/zero of=/gluster/test bs=8k count=128k conv=fsync
> 131072+0 records in
> 131072+0 records out
> 1073741824 bytes (1.1 GB) copied, 6.61025 s, 162 MB/s
>
> # dd if=/dev/zero of=/gluster/test bs=128k count=8k conv=fsync
> 8192+0 records in
> 8192+0 records out
> 1073741824 bytes (1.1 GB) copied, 6.43005 s, 167 MB/s
>
> When I perform the same test on the glusterfs mountpoint I get 
> following results:
> # dd if=/dev/zero of=/mnt/sharedfs/test bs=8k count=128k conv=fsync
> 131072+0 records in
> 131072+0 records out
> 1073741824 bytes (1.1 GB) copied, 22.7804 s, 47.1 MB/s
>
> # dd if=/dev/zero of=/mnt/sharedfs/test bs=128k count=8k conv=fsync
> 8192+0 records in
> 8192+0 records out
> 1073741824 bytes (1.1 GB) copied, 9.43556 s, 114 MB/s