Re: Observations on LG_NAS, mvgbe0 issue?

[Reinoud Zandijk <reinoud%NetBSD.org@localhost>]

Hi Robert,

On Tue, Jul 02, 2013 at 12:29:36PM +0100, Robert Swindells wrote:
> Could you try setting ipginttx to 0 ?

While setting this i am tarring a directory full of big files on the NAS's NFS
share creating the disc activity:

nas# sysctl -w hw.mvgbe.mvgbe0.ipginttx=0
hw.mvgbe.mvgbe0.ipginttx: 768 -> 0
nas# iostat -w 1
      tty              wd0             CPU
 tin tout  KB/t  t/s  MB/s  us ni sy in id
   0    1 26.18    3 0.084   2  0  1  0 97
   0   76 35.97  303 10.64   2  0 29 63  6
   0   28 36.55  336 12.01   0  0 33 67  0
   0   21 38.89  315 11.97   0  0 29 71  0
   0   34 30.48  372 11.07   2  0 26 65  7
   0   22 16.55  706 11.40   0  0 30 69  2
   0   23 35.69  337 11.75   0  0 30 69  1
   0   25 36.07  321 11.32   0  0 31 64  5
   0   22 34.42  352 11.82   0  0 29 71  0
   0   30 34.87  337 11.47   0  0 36 62  2
^C
nas# sysctl -w hw.mvgbe.mvgbe0.ipginttx=2048
hw.mvgbe.mvgbe0.ipginttx: 0 -> 2048
nas# iostat -w1
      tty              wd0             CPU
 tin tout  KB/t  t/s  MB/s  us ni sy in id
   0    1 26.20    3 0.084   2  0  1  0 97
   0  100 34.95  378 12.90   0  0 27 71  2
   0   27 33.57  328 10.75   1  0 29 55 15
   0   36 20.73  578 11.70   0  0 30 66  4
   0   36 16.73  752 12.30   0  0 45 53  2
   0   26 16.27  773 12.28   0  0 38 62  0
   0   24 16.22  747 11.83   0  0 27 72  1
   0   38 16.25  768 12.18   0  0 37 62  1
   0   25 17.59  601 10.33   0  0 27 51 21
   0   44 32.35  179 5.662   0  0 13 27 60
   0   44 33.60  178 5.848   0  0 13 37 50
   0   44 35.83  165 5.786   0  0 14 36 50
   0   34 17.75  643 11.15   0  0 22 67 11
   0   30 16.10  754 11.86   0  0 32 68  1
   0   26 19.43  497 9.430   0  0 25 50 25

As you can see, no real noticable performance gain nor losses on this setting 
:-/

Reinoud