Gluster users - Sep 2013 - Gluster samba vfs read performance slow

Hi

	We use gluster samba vfs test io,but the read performance via vfs is half of
write perfomance,
but via fuse the read and write performance is almost the same.

this is our smb.conf:
[global]
        workgroup = MYGROUP
        server string = DCS Samba Server
        log file = /var/log/samba/log.vfs
        max log size = 500000
#       use sendfile = true
        aio read size = 262144
        aio write size = 262144
        aio write behind = true
        min receivefile size = 262144
        write cache size = 268435456
        security = user
        passdb backend = tdbsam
        load printers = yes
        cups options = raw
        read raw = yes
        write raw = yes
        max xmit = 262144
        socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=262144
SO_SNDBUF=262144
        kernel oplocks = no
        stat cache = no

any advises helpful?

thanks
 
kane                     
----------------------------------------------------------------

Email:  kai.zhou at soulinfo.com
??:    0510-85385788-616



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On 09/13/2013 06:10 PM, kane wrote:
> Hi
>
> We use gluster samba vfs test io,but the read performance via vfs is
> half of write perfomance,
> but via fuse the read and write performance is almost the same.
>
> this is our smb.conf:
> [global]
>          workgroup = MYGROUP
>          server string = DCS Samba Server
>          log file = /var/log/samba/log.vfs
>          max log size = 500000
> #       use sendfile = true
>          aio read size = 262144
>          aio write size = 262144
>          aio write behind = true
>          min receivefile size = 262144
>          write cache size = 268435456
>          security = user
>          passdb backend = tdbsam
>          load printers = yes
>          cups options = raw
>          read raw = yes
>          write raw = yes
>          max xmit = 262144
>          socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=262144
> SO_SNDBUF=262144
>          kernel oplocks = no
>          stat cache = no
>
> any advises helpful?
>
This patch has shown improvement in read performance with libgfapi:

http://review.gluster.org/#/c/5897/

Would it be possible for you to try this patch and check if it improves 
performance in your case?

-Vijay