Re: FIO read test, why net recv 91MB/s, read only 22MB/s

["Dang Zhiqiang" <dzq008@xxxxxxx>]

Is this phenomenon normal when use gluster default configure?

At 2015-01-28 13:19:47, "Dang Zhiqiang" <dzq008@xxxxxxx> wrote:

Hi,

    I want to known why net recv 91MB/s, read only 22MB/s when do FIO read test. 

    when I set cache-size=2GB or disable open-behind, this phenomenon disappears.

    thanks.

gluster 3.4.5 (default configure)

centos 6.5

replica 2, 2 server

client do FIO test

FIO command:

fio -directory=/mnt/dzq -direct=1 -ioengine=sync -rw=read -bs=32K -size=1G -numjobs=8 -runtime=60 -ramp_time=20 -exitall -group_reporting -name=glfs_test

output:

glfs_test: (g=0): rw=read, bs=32K-32K/32K-32K/32K-32K, ioengine=sync, iodepth=1
...
fio-2.1.13
Starting 8 processes

read : io=1327.3MB, bw=22647KB/s, iops=707, runt= 60012msec

# dstat -nN  eth1,total

--net/eth1---net/total-
 recv  send: recv  send
  91M 1977k:  91M 1977k
  91M 1969k:  91M 1969k
  91M 1986k:  91M 1986k
  90M 1972k:  90M 1972k

......

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