Mounting with selinux gives poor performance

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Hi,

 

I don’t know if this a bug or I am doing something wrong. But it seem that mounting a volume with acl,selinux results in poor performance.

 

The odd thing is that sometimes it’s really slow and other times it just relatively slow.

 

I tried both on  glusterfs version 3.6.2 and 3.6.3. The file system on the bricks are xfs created with “-i size=512” and the gluster volume is a “Distributed-Replicate, Bricks: 2 x 2 = 4”.

 

HowTo repro

# dd if=/dev/zero of=/tmp/masterfile bs=1M count=1000

# shred /tmp/masterfile

# mkdir /mnt/selinuxtst /mnt/noselinuxtst

# mount -t glusterfs -o rw,acl,selinux localhost:glu_fs /mnt/selinuxtst

# mount -t glusterfs -o rw,acl localhost:glu_fs /mnt/noselinuxtst

 

My different results with selinux

# time cp /tmp/masterfile /mnt/selinuxtst/master_selinux01

real    0m12.705s

user    0m0.007s

sys     0m0.660s

 

# time cp /tmp/masterfile /mnt/selinuxtst/master_selinux02

real    7m22.605s

user    0m0.025s

sys     0m1.776s

 

My different results without selinux

# time cp /tmp/masterfile /mnt/noselinuxtst/master_noselinux01

real    0m2.560s

user    0m0.007s

sys     0m0.661s

 

# time cp /tmp/masterfile /mnt/noselinuxtst/master_noselinux02

real    0m3.588s

user    0m0.004s

sys     0m0.590s

 

 

 

 

 

 

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