[Pkg-samba-maint] Bug#856463: Bug#856463: Bug#856463: cifs-utils: Accessing files with length of 1067 bytes extremly slow

[Mathieu Parent]

2017-03-09 13:30 GMT+01:00 Stephan Gampert | GIP <stephan.gampert at gip.com>:
> Hello Mathieu,
>
> thank you very much for your answer.
>
> Unfortunately we need the symlinks, so removing the mfsymlinks option is not
> really an option for us.
>
> We've already tried to use jessy. We had the same problem there.
> We will test it with Debian stretch.

OK.

>  > It is because the complete file is parsed whien its size is 1067 bytes.
> ....
>  > However, the slowness is probably coming from the server side.
>
> I've attached a wireshark trace of a "slow read". 10.0.9.149 is the
> Debian-client, 10.0.21.11 is the Windows Server.
>
> As you can see, all seems ok from package 1-25. The file is read once
> (FID 0x009a) and is closed. I presume this is the parse for the symlink.
>
> The next 4 packets seem strange for me. It looks like the Debian client
> opens the file again 2 times in parallel (FID:0xc0f5 and FID 0x0017) and
> the Server is sending a lock request back to the Debian-client (which is
> not answered by the way).
>
> Do you expect the Debian-client to open the file again 2 times in parallel?

I can't say for sur. But this looks strange. But why is packet 34 more
than 7 seconds after packet 28?

Can you post here the debugdata and the kernel log as per:
https://wiki.samba.org/index.php/LinuxCIFS_troubleshooting

Regards

-- 
Mathieu Parent