Very bad performance when copying large files from windows to samba-share

[Esh, Andrew]

I looked at the captures of win98 uploading to amithlon and redhat. They are
not rabbit-pellet mode. The protocol is using full sized packets, 64K
chunks, and has between two and four packets on the wire at a time. There
are no flush commands present, which is the main characteristic of the slow
transfer mode.

Those two transfers appear to be operating rather quickly, with end-to-end
response time in the 6-10ms range, and streamed packet intervals around
30us. I measured one 64K chunk taking 260ms to be transferred, which is
close to a 2Mb/S transfer rate.

Is there something else I should look at?

-----Original Message-----
From: Ulf Bertilsson [mailto:ulf.bertilsson at adcomdata.no]
Sent: Monday, June 24, 2002 2:54 AM
To: Esh, Andrew; crh at umn.edu; David.Collier-Brown at Sun.COM
Cc: samba-technical at samba.org
Subject: RE: Very bad performance when copying large files from windows
to samba-share
Importance: Low


I finaly got the mashine up and running again =D

If it's still interesting here is a download point for captures..

http://www.birrabrothers.com/tiger/download/

I'm puzzeled over that I also have this error in win2k.

--
Ulf

-----Original Message-----
From: Esh, Andrew [mailto:AEsh at tricord.com]
Sent: Monday, April 22, 2002 4:15 PM
To: Ulf Bertilsson; crh at umn.edu; David.Collier-Brown at Sun.COM
Cc: samba-technical at samba.org
Subject: RE: Very bad performance when copying large files from windows
to samba-share


Please send a copy of any tcpdumps to me as well, if you would. I spent
a lot of time characterizing the Rabbit Pellet transfer mode. I'll
recognize it right away, if that is what this is.
-----Original Message----- 
From: Ulf Bertilsson [mailto:ulf.bertilsson at adcomdata.no] 
Sent: Monday, April 22, 2002 3:01 AM 
To: crh at umn.edu; David.Collier-Brown at Sun.COM 
Cc: samba-technical at samba.org 
Subject: RE: Very bad performance when copying large files from windows 
to samba-share 
Importance: Low 


> >         Just out of curiosity, what did security=server contribute: 
> >         added latency in some obscure part of the process??? 
> 
> As far as we could tell...  yes.  ;) 
> 
> I really should have documented that whole episode. 
I have an current "issue" with Samba 2.0.7 and an Win98 box. 
Peak at ~800kb/s one way, 20-30kb/s other way (10MB enviroment) 
I have some captures I will show Chris. 
Could be relevant in this contex.. 
Otherwise, sorry for the OT :) 
-- 
Ulf 
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