Samba performance with Sendfile

[Nathan Stine]

Hello all,

I installed Alt-F this weekend on my DNS-321 and noticed that my performance over SMB was not as good as the stock firmware.  I found a post where someone who was running a similarly underpowered NAS device recommended disabling sendfile in smb.conf.  My speed went from about 6-7 MB/s to about 12-13MB/s.  Not bad!  I did try screwing around with jumbo frames, but didn't see much of a difference.

In the stock smb.conf that comes with Alt-F, there is a line that explicitly sets sendfile to on.  All you have to do is change the yes to a no and restart the service.

YMMV, of course, but I thought I'd add my experience to the group so that others might be able try the same and see if it helps.

Nathan A. Stine

[João Cardoso]

On Monday, 4 May 2015 22:31:18 UTC+1, Nathan Stine wrote:

Hello all,

I installed Alt-F this weekend on my DNS-321 and noticed that my performance over SMB was not as good as the stock firmware.  I found a post where someone who was running a similarly underpowered NAS device recommended disabling sendfile in smb.conf.  My speed went from about 6-7 MB/s to about 12-13MB/s.

You are taking here of Alt-F or the D-Link firmware? My default throughput is also 10/12 MB/s with sendfile enabled.

And sendfile was enabled by default after some users report that their throughput increased when setting it!

 

 Not bad!  I did try screwing around with jumbo frames, but didn't see much of a difference.

In the stock smb.conf that comes with Alt-F, there is a line that explicitly sets sendfile to on.  All you have to do is change the yes to a no and restart the service.

YMMV, of course, but I thought I'd add my experience to the group so that others might be able try the same and see if it helps.

Thanks!

Unfortunately Samba has some 3 hundred tunable parameters, and each user experience is different from other users. It depends on network setup, usage, and target OS -- Win6/7/8/linux...

 

Nathan A. Stine

[Nathan Stine]

On Tuesday, May 5, 2015 at 10:57:16 AM UTC-4, João Cardoso wrote:

On Monday, 4 May 2015 22:31:18 UTC+1, Nathan Stine wrote:

Hello all,

I installed Alt-F this weekend on my DNS-321 and noticed that my performance over SMB was not as good as the stock firmware.  I found a post where someone who was running a similarly underpowered NAS device recommended disabling sendfile in smb.conf.  My speed went from about 6-7 MB/s to about 12-13MB/s.

You are taking here of Alt-F or the D-Link firmware? My default throughput is also 10/12 MB/s with sendfile enabled.

And sendfile was enabled by default after some users report that their throughput increased when setting it!

Alt-F.  D-Link was about 9-10 MB/s.  So now after disabling sendfile, my Alt-F throughput is better than the stock D-Link firmware.

 

 

 Not bad!  I did try screwing around with jumbo frames, but didn't see much of a difference.

In the stock smb.conf that comes with Alt-F, there is a line that explicitly sets sendfile to on.  All you have to do is change the yes to a no and restart the service.

YMMV, of course, but I thought I'd add my experience to the group so that others might be able try the same and see if it helps.

Thanks!

Unfortunately Samba has some 3 hundred tunable parameters, and each user experience is different from other users. It depends on network setup, usage, and target OS -- Win6/7/8/linux...

 

Indeed.  I did a decent amount of research and found more than what I bargained for.

 

Nathan A. Stine