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Xia, Arandar

2009-Apr-27 07:48 UTC

[Samba] Poor performance when accessing Linux from Windows XP because of too many QUERY_FILE_INFO requests

Dear all,
My question is described as follows.

Server: Linux
      Samba-3.3.1
Client: Windows XP with SP3

Step1: connect to the samba server.
Step2: select a directory name ?test?. (The directory is created before
testing.)

The client will send a lot of QUERY_FILE_INFO requests. According to data
captured by Wireshark, I find the following phenomenon:
The client repeats exactly the same queries many times before giving up. The
whole network log repeats exactly the same sequence, only the FID is different
every time. In my test FID changes from 0x3002 to 0x306a.
If I use a Linux client, this does not happen.

This problem makes the access to my samba server be very slow.
Could anyone help me to find the reason and give a solution?

The following data is only a part of community data.
No.  Source       Destination   Protocol    Info
26   client        server        SMB      Trans2 Request, QUERY_PATH_INFO, Query
File Basic Info, Path:
27   server        client        SMB      Trans2 Response, QUERY_PATH_INFO
28   client        server        SMB      Trans2 Request, FIND_FIRST2, Pattern:
\test
29   server        client        SMB      Trans2 Response, FIND_FIRST2, Files:
test
30   client        server        SMB      NT Create AndX Request, Path: \test
31   server        client        SMB      NT Create AndX Response, FID: 0x3002
32   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File Internal Info
33   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
34   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File Basic Info
35   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
36   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File Standard Info
37   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
38   client        server        SMB      Trans2 Request, QUERY_FS_INFO, Query
FS Volume Info
39   server        client        SMB      Trans2 Response, QUERY_FS_INFO
40   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File Basic Info
41   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
42   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File Standard Info
43   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
44   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3002, Query File EA Info
45   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
46   client        server        SMB      NT Create AndX Request, Path:
\test:{4c8cc155-6c1e-11d1-8e41-00c04fb9386d}:$DATA
47   server        client        SMB      NT Create AndX Response, Error:
STATUS_OBJECT_PATH_NOT_FOUND
48   client        server        SMB      Close Request, FID: 0x3002
49   server        client        SMB      Close Response
50   client        server        SMB      NT Create AndX Request, Path: \test
51   server        client        SMB      NT Create AndX Response, FID: 0x3004
52   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File Internal Info
53   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
54   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File Basic Info
55   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
56   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File Standard Info
57   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
58   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File Basic Info
59   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
60   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File Standard Info
61   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
62   client        server        SMB      Trans2 Request, QUERY_FILE_INFO, FID:
0x3004, Query File EA Info
63   server        client        SMB      Trans2 Response, QUERY_FILE_INFO
64   client        server        SMB      NT Create AndX Request, Path:
\test:{4c8cc155-6c1e-11d1-8e41-00c04fb9386d}:$DATA
65   server        client        SMB      NT Create AndX Response, Error:
STATUS_OBJECT_PATH_NOT_FOUND
66   client        server        SMB      Close Request, FID: 0x3004
67   server        client        SMB      Close Response

Best Regards!
------------------------------
Xia Zeyi
arandar.xia@chn.fujixerox.com

Volker Lendecke

2009-Apr-27 08:39 UTC

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[Samba] Poor performance when accessing Linux from Windows XP because of too many QUERY_FILE_INFO requests

On Mon, Apr 27, 2009 at 03:48:43PM +0800, Xia, Arandar
wrote:> This problem makes the access to my samba server be very slow.
> Could anyone help me to find the reason and give a solution?
Sorry, but that's most likely just Windows behaviour. Are
you sure that it is that that makes access slow?

Volker
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Volker Lendecke

2009-Apr-27 09:55 UTC

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[Samba] Poor performance when accessing Linux from Windows XP because of too many QUERY_FILE_INFO requests

On Mon, Apr 27, 2009 at 05:48:17PM +0800, Xia, Arandar
wrote:> > Windows Vista as client or Windows Vista as server for your XP client?
> Windows Vista is also as a client. Linux is the server.
Please connect from XP as a client to your Vista box and
compare the traffic generated.
> > What *exactly* is slow?
> Sorry.
> Samba service is slow. Sometimes I need to wait a while
> for a simple action to be done on the client side.
I very much doubt that has to do with those many requests.
It very likely is something different. But as you are not
answering the question what *exactly* is slow, nobody can
tell.
> What I really care is whether such behavior of Windows XP
> is normal and how to solve the problem if it is abnormal.
See my initial reply: This is very likely just normal
Windows XP behaviour. What is missing for you here?

Volker
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Xia, Arandar

2009-Apr-27 10:32 UTC

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[Samba] Poor performance when accessing Linux from Windows XP because of too many QUERY_FILE_INFO requests

> Please connect from XP as a client to your Vista box and compare the
traffic generated.If using Vista as the server, the requests are different. But the client will
still send a lot of other requests.
> I very much doubt that has to do with those many requests.
> It very likely is something different. But as you are not answering the
question what *exactly* is slow, nobody can tell.If using default file system, I think it is fast enough to make you ignore the
time spent on these requests.
But if using other VFS slower than the default file system, I have to find out
what do these requests really for. Because they seem to be unnecessary and make
my Samba service slow.
> See my initial reply: This is very likely just normal Windows XP behaviour.
What is missing for you here?Thanks for your help.

// Zeyi

-----Original Message-----
From: Volker Lendecke [mailto:Volker.Lendecke@SerNet.DE] 
Sent: 2009?4?27? 17:56
To: Xia, Arandar
Cc: samba@lists.samba.org
Subject: Re: [Samba] Poor performance when accessing Linux from Windows XP
because of too many QUERY_FILE_INFO requests

On Mon, Apr 27, 2009 at 05:48:17PM +0800, Xia, Arandar
wrote:> > Windows Vista as client or Windows Vista as server for your XP client?
> Windows Vista is also as a client. Linux is the server.
Please connect from XP as a client to your Vista box and
compare the traffic generated.
> > What *exactly* is slow?
> Sorry.
> Samba service is slow. Sometimes I need to wait a while
> for a simple action to be done on the client side.
I very much doubt that has to do with those many requests.
It very likely is something different. But as you are not
answering the question what *exactly* is slow, nobody can
tell.
> What I really care is whether such behavior of Windows XP
> is normal and how to solve the problem if it is abnormal.
See my initial reply: This is very likely just normal
Windows XP behaviour. What is missing for you here?

Volker

mzalfres@wp.pl

2009-Apr-27 11:26 UTC

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Odp: RE: [Samba] Poor performance when accessing Linux from Windows XPbecause of too many QUERY_FILE_INFO requests

Xia,


I have just looked at your problem - I got something similar recently 
and solution was in client PC networking card settings. QUERY_FILE_INFO 
requests were not the problem. My card was capable of 1Gb, while it was 
set to fixed 100MB Full duplex. This for some reason caused transfer 
from windows to linux samba terribly slow, while anything else was 
working OK.

Solution was to put the NIC in auto negotiation mode. Now our domain 
works like a charm on linux PDC. :)

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