Gluster users - Sep 2015 - Mounting with selinux gives poor performance

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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