[Pkg-samba-maint] Bug#444600: samba 3.0.26a-1 / Debian/Lenny sendfile(?) performance problems

[Justin Piszcz]

Package: samba
Version: 3.0.26a-1

Kernel: 2.6.22

samba 3.0.26a-1 performance < 900 KiB/s, but FTP = 30-90 MiB/s

Let me start out by saing this is an oddball problem:

SAMBA:
LINUX -> WINDOWS = < 900 KiB/s (varies between 100 - 900 KiB/s)
WINDOWS -> LINUX = 30-90 MiB/s (always)

FTP:
Either direction, 30-90 MiB/s (always)

I do not see any nasty errors in the logs even with verbose = 5.

Any ideas here? I am not using any special options.

# cat /etc/samba/smb.conf

[global]
         log level = 5
         workgroup = WORKGROUP
         server string = %h - Pentium IV 3.4GHZ
         security = user
         encrypt passwords = true

[user]
   comment         = user
   path            = /home/user
   writable        = yes
   valid users     = user
   create mask     = 644

--

Here, FTP for pulling files from Linux.

ftp> mget *
200 TYPE is now 8-bit binary
200 PORT command successful
150-Connecting to port 1255
150 715924.0 kbytes to download
226-File successfully transferred
226 13.687 seconds (measured here), 51.08 Mbytes per second
ftp: 733106176 bytes received in 13.69Seconds 53562.23Kbytes/sec.
200 PORT command successful
150-Connecting to port 1256
150 716272.0 kbytes to download
226-File successfully transferred
226 13.032 seconds (measured here), 53.67 Mbytes per second
ftp: 733462528 bytes received in 13.05Seconds 56216.95Kbytes/sec.
200 PORT command successful
150-Connecting to port 1257
150 713200.0 kbytes to download
226-File successfully transferred
226 12.869 seconds (measured here), 54.12 Mbytes per second
ftp: 730316800 bytes received in 12.88Seconds 56723.63Kbytes/sec.

Here, FTP for pushing files to Linux.

ftp> mput 1 2 3
200 PORT command successful
150 Connecting to port 1263
226-File successfully transferred
226 12.802 seconds (measured here), 54.61 Mbytes per second
ftp: 733106176 bytes sent in 12.80Seconds 57287.35Kbytes/sec.
200 PORT command successful
150 Connecting to port 1264
226-File successfully transferred
226 12.949 seconds (measured here), 54.02 Mbytes per second
ftp: 733462528 bytes sent in 12.95Seconds 56624.92Kbytes/sec.
200 PORT command successful
150 Connecting to port 1265
226-File successfully transferred
226 15.400 seconds (measured here), 45.23 Mbytes per second
ftp: 730316800 bytes sent in 15.38Seconds 47500.28Kbytes/sec.

But (all I can offer is packet dumps/traces or bandwidth measurements):

Incoming:                               Outgoing:
Curr: 0.00 MByte/s                      Curr: 0.07 MByte/s
Avg: 0.00 MByte/s                       Avg: 0.07 MByte/s
Min: 0.00 MByte/s                       Min: 0.07 MByte/s
Max: 0.00 MByte/s                       Max: 0.07 MByte/s
Ttl: 1898.08 MByte                      Ttl: 2954.92 MByte

LOCAL <-> REMOTE                                          TXBPS   RXBPS TOTALBPS
  (IP)              PORT  PROTO  (IP)              PORT       TX      RX    TOTAL
linuxbox <-> p4w.internal.lan          546k/s 4.74k/s 551k/s
192.168.0.1     445    TCP  192.168.0.2    1259    6.88m    106k  6.99m

Why do I get such poor performance when trying to retrieve a file off the Linux box?  This is a very strange problem.

Linux:

$ netstat -i
Kernel Interface table
Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR 
Flg
eth0   1500 0  14049682      0      0      0 11354070      0      0      0 BMRU
lo    16436 0     45335      0      0      0    45335      0      0      0 LRU

Windows:

netstat -s

IPv4 Statistics

   Packets Received                   = 5053597
   Received Header Errors             = 0
   Received Address Errors            = 19
   Datagrams Forwarded                = 0
   Unknown Protocols Received         = 0
   Received Packets Discarded         = 2
   Received Packets Delivered         = 5053595
   Output Requests                    = 3655144
   Routing Discards                   = 0
   Discarded Output Packets           = 0
   Output Packet No Route             = 0
   Reassembly Required                = 0
   Reassembly Successful              = 0
   Reassembly Failures                = 0
   Datagrams Successfully Fragmented  = 0
   Datagrams Failing Fragmentation    = 3
   Fragments Created                  = 0

ICMPv4 Statistics

                             Received    Sent
   Messages                  47          24
   Errors                    0           0
   Destination Unreachable   25          2
   Time Exceeded             0           0
   Parameter Problems        0           0
   Source Quenches           0           0
   Redirects                 0           0
   Echos                     0           22
   Echo Replies              22          0
   Timestamps                0           0
   Timestamp Replies         0           0
   Address Masks             0           0
   Address Mask Replies      0           0

TCP Statistics for IPv4

   Active Opens                        = 204
   Passive Opens                       = 14
   Failed Connection Attempts          = 16
   Reset Connections                   = 59
   Current Connections                 = 3
   Segments Received                   = 5051709
   Segments Sent                       = 3654327
   Segments Retransmitted              = 76

UDP Statistics for IPv4

   Datagrams Received    = 1826
   No Ports              = 58
   Receive Errors        = 3
   Datagrams Sent        = 716


Justin.