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RE: [Samba] Performance issue with Vista

Subject: RE: [Samba] Performance issue with Vista
From: "Mikko Pukki"
Date: Fri, 23 Feb 2007 18:30:59 +0200
>these problems have been discussed many times in the last weeks.
>Solution: get rid of SO_RCVBUF=8192 and SO_SNDBUF=8192 and your speed 
>will increase.
>modern kernels do a much better job in handling these buffersizes than 
>you can.

And because of those discussions I tried also without changing buffers and I 
also tried to change them to 16384 (I noticed that in first mail I sent 
modifiers are on the wrong line but they are correct in actual smb.conf). When 
at 8192 or 16384 it gave once a burst of 500 Mbit/s but it lasted only for half 
a second. Maybe something from previous transfer was buffered somewhere (I'm 
not an expert on CIFS and Vista is quite new for me). After that peak tansfer 
drops to ~5Mbit/s and rises to 60 Mbit/s and drops again. Average might be 
close to 40 Mbit/s. Those 60 Mbit peaks seem quite flat topped in task manager. 
It does this no matter what buffer sizes I have tried. With last configuration 
I was able to read 25MB/s from smbclient.

If I recall correctly, I got best transfer speeds with smbclient when socket 
options were default. No matter what the settings are, writing from Vista to 
Samba is always faster than from another Linux machine using smbclient. I also 
tried NFS and SCP transfers and they lagged big time behind Samba. Kernel in 
Linux is 2.6.8-3 if that makes any difference. Would upgrading Samba help? 
There would only be one problem in updating from 3.0.14a-3s.. All the systems 
should use Sarge and that is newest version available.

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