FTP Time trials

[rob@xxxxxxxxx]

I wanted to do some time trials, before and after changing key FTP and/or 
TCP settings.

I used a guest lpar, GDI, and it's host, MAIL3.  The guest lpar was not 
optimally set up.  GDI only runs on two storage spaces (with a wide 
disparity in size between the two).  I picked these because I could bring 
down TCP/IP without incurring the users wrath.

GDI had the least amount of free space, just 88GB.  Neither system was too 
busy.

GDI
Sys      Pool   Reserved    Max  ----DB-----  --Non-DB---
Pool    Size M   Size M     Act  Fault Pages  Fault Pages
  1     729.73    248.09  +++++     .0    .0    1.4   1.7
  2    5935.38     51.72    203     .0    .0    3.7   8.1
  3     162.37       .00     41     .0    .0     .0    .0
  4      81.18       .00      5     .0    .0     .0    .0
  5    1210.31     13.25     21     .0    .0     .0    .0

               Size    %     I/O   Request   Read  Write   Read  Write % 
Unit  Type      (M)  Used    Rqs  Size (K)    Rqs   Rqs     (K)   (K) Busy
   1  6B22   233020  64.6   95.2      4.5      .0   95.2     .0    4.5 1
   2  6B22    93212  93.6    5.3      4.5     1.3    3.9    4.5    4.5 1

MAIL3
System    Pool    Reserved    Max   -----DB-----  ---Non-DB---
 Pool   Size (M)  Size (M)  Active  Fault  Pages  Fault  Pages
   1      836.98    428.39   +++++     .0     .0    1.8    2.5
   2    14079.37     40.51    1055     .1    4.7   55.4  273.9
   3     1657.39       .00       9     .0     .0    2.7    5.4
   4         .25       .00       5     .0     .0     .0     .0
               Size    %     I/O   Request   Read  Write   Read  Write % 
Unit  Type      (M)  Used    Rqs  Size (K)    Rqs   Rqs     (K)   (K) Busy
   1  433C   139594  59.3    3.8     21.4     1.0    2.8   62.0    6.7 3
   1  433C   139594  59.3    4.6     10.6     2.4    2.1   13.4    7.5 2
   2  4328   123488  59.3    2.9     29.3     1.0    1.9   67.5    9.0 0
   3  4328   141129  59.3    5.5     29.5     2.6    2.8   39.2   20.3 1
   4  4328   123488  59.3    1.6     46.4     1.0     .6   48.5   43.2 0
   5  4328   123488  59.3    3.9     21.4     1.6    2.3   40.6    7.5 0
   6  4328   123488  59.3    4.7     32.5     2.3    2.4   44.0   21.6 1
   7  4328   123488  59.3    1.7     25.4      .7    1.0   47.3    9.0 0
   8  4328   123488  59.3    3.4     28.5     1.1    2.3   44.0   20.8 0
   9  4328   123488  59.3    5.3     38.8     2.6    2.6   43.6   34.0 1
  10  4328   123488  59.3    4.1     26.8     1.9    2.1   48.8    7.5 1
  11  4328   141129  59.3    3.7     24.2     1.6    2.0   43.3    8.7 0
  12  4328   141129  59.3    8.2     15.8     6.1    2.0   14.2   20.7 2
  13  4328   141129  59.3   11.0     15.1     7.8    3.2   13.9   18.0 1
  14  4328   141129  59.3    7.0     17.8     5.1    1.9   15.1   25.0 0
  15  4328   141129  59.3   10.7     14.1     6.9    3.8   14.5   13.3 2
  16  4328   141129  59.3    1.9     13.0     1.2     .6    7.6   24.0 0
  17  4328   141129  59.3    4.3     25.8     1.6    2.6   21.5   28.5 0
  18  4327    52923  59.3    1.5     10.0      .1    1.4   12.0    9.8 0
  19  4327    52923  59.3    1.9      6.9      .7    1.1    4.0    8.8 0
  20  4327    52923  59.3    1.7      8.2     1.2     .5    4.0   19.0 0
  21  4327    70564  59.3    3.9     29.8     1.9    2.0   29.3   30.2 0
  22  4327    70564  59.3    1.5     25.3      .2    1.2  128.0    4.8 0
  23  4327    52923  59.3    1.0     14.5      .7     .2   18.0    4.0 0

To create a large chuck of data to FTP I performed the following:
I saved a DB2 PF of this size
Size . . . . . . . . . . . . . . . . :   13186801664
Offline size . . . . . . . . . . . . :   13186760704
into a save file.  The resultant size of the save file was 25580260992. 
(Big huge difference!)
Knowing that FTPing save files creates a high level of inefficiency I used 
CPY to copy it to a stream file in a stream file directory just off the 
root of the IFS.  Size of the file is 25580260992.

GDI has an IP address of 10.17.6.xxx and MAIL3 has an IP address of 
10.17.7.xxx.  Basically they are not on the same subnet and must pass 
through a switch.
This is a match on both lpars:  CHGTCPA TCPRCVBUF(8192) TCPSNDBUF(8192)
And this matches on both lpars:
DSPLIND
Line speed . . . . . . . . . . . . :   *AUTO
Current line speed . . . . . . . . :   1G 
Duplex . . . . . . . . . . . . . . :   *AUTO
Current duplex . . . . . . . . . . :   *FULL
Serviceability options . . . . . . :   *NONE
Maximum frame size . . . . . . . . :   1496 

Did a transfer from GDI to MAIL3:
25580260992 bytes transferred in 1374.158 seconds. Transfer rate 18615.223 
KB/sec.
Deleted in on GDI and sent it back:
25580260992 bytes transferred in 2403.694 seconds. Transfer rate 10642.061 
KB/sec.
Deleted it on MAIL3 and sent it back:
25580260992 bytes transferred in 1342.492 seconds. Transfer rate 19054.309 
KB/sec.
Deleted it on GDI and sent it back:
25580260992 bytes transferred in 2086.183 seconds. Transfer rate 12261.756 
KB/sec.

So far the guest lpar looks better at sending then receiving.  Could be a 
WRKDSKSTS thing.

Brought systems down into restricted state.  Ran CHGTCPA TCPRCVBUF(262144) 
TCPSNDBUF(262144).
IPLed.  Did a few things to let system settle.

Did a transfer from GDI to MAIL3:
25580260992 bytes transferred in 1877.477 seconds. Transfer rate 13624.810 
KB/sec. 
Deleted in on GDI and tried to send it back but after about 10G I got an 
ABOR.
Deleted what was there on GDI and tried again:
25580260992 bytes transferred in 2165.111 seconds. Transfer rate 11814.756 
KB/sec.
Deleted it on MAIL3 and sent it back:
25580260992 bytes transferred in 1715.588 seconds. Transfer rate 14910.493 
KB/sec.
Deleted it on GDI and tried to send it back.  After about 10G I got: 
TCP12B9 Unable to send data to server.
Deleted it on GDI again and tried sending it again:
25580260992 bytes transferred in 2158.348 seconds. Transfer rate 11851.779 
KB/sec,

For some reason that doesn't seem like an improvement.


Rob Berendt