Re: [osol-discuss] intrd(1M) what is it?

[Richard L. Hamilton]

If I'm not misled, intrd is a perl script that monitors kstats to discover
and correct imbalances of interrupt distribution between devices and
CPUs; you should be able to look at it to get some idea of what it's doing or 
why.

It looks to me just from the comments in the code that it's quite aware that
there may be situations that look imbalanced and yet where its changes may
not result in any improvement.  Which is not to say that it's perfectly tuned
yet.  

Maybe intrstat(1m) might be of use to see the sort of thing it appears
to be shuffling, namely the assignment of particular device interrupts to 
particular
CPUs (if my interpretation of what I've looked at is correct).

If someone in the know happens to be watching, perhaps they'd have some
advice for how to find out more about whether it's doing anything useful
in a particular situation.

Since you mention patents, there's a quite verbose description in the
patent application of what it _may_ be doing:

http://www.freepatentsonline.com/y2007/0043347.html
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[osol-discuss] intrd(1M) what is it?

[Qiang Liu]

Hi 

As a device driver guy, I care about interrrupt, on Solaris (Nevada_94 for 
example) there is a intrd (/usr/lib/intrd)which was triggered to do something 
during my heavy IO run. 

23:26:51.891 ++/var/adm/messages: Aug 28 23:26:48 sfx4600 intrd[669]: 
Optimizing interrupt assignments
23:26:51.891 ++/var/adm/messages: Aug 28 23:26:48 sfx4600 intrd[669]: Interrupt 
assignments optimized

However, mpstat does not show any interrupt distribution, perf in vdbench is 
not improved at all.

There is a related US patent (US 2007/0043347 A1) by Ethan Solomita, Sunay 
Tripathi and Jerry Chu. 

#
# mpstat 10
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0  284   8   60   533  160  780   11   50   561  20463  11   0  86
  1  194   6   34   256   12  8996   30   381  22333  11   0  86
  2  340  17   57   230   79 1005   12   57   691  30184   6   0  90
  3  278  17   64   1642    11   52   661  28924   3   0  92
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   09   368  162  1230320 10   0   0 100
  10   00710  1270310430   0   0 100
  25   0067   27   711310450   0   0 100
  30   00451   830200230   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   05   366  161  1090210 20   0   0 100
  10   00560  1010210420   0   0 100
  22   00523   930200300   0   0 100
  30   00391   720110340   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0   14   25   373  161  1120310   1980   0   0 100
  11   00655  1030210390   0   0 100
  24   00605  1040210310   0   0 100
  30   00381   700100340   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   07   368  163  1000220100   0   0 100
  10   00620  1080220380   0   0 100
  22   00638  1010210360   0   0 100
  30   00371   670100290   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   06   365  161   950220120   0   0 100
  10   00590  1020220320   0   0 100
  20   00635  1050210310   0   0 100
  30   03391   710110340   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  0  357   1  391  2790  179 20683  933  261 33500 200716  41   0  52
  1  254   1  322  1579 1030  602   53   72 55360   6430  42   0  58
  2 1791   0  202  26626 20656  911  539 33110 188466  35   0  59
  3  740   0  201  27121 20878  963  521 33060 183036  33   0  61
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   0   27  5383  176 54801 2271  210 83500 52619   15  85   0   0
  10   06  2695 2666  138   13   12 99010   1130 100   0   0
  2   43   04 107316 55332 4310  761 83240 48689   15  82   0   2
  30   0   20 106851 56071 4394  753 84130 49171   15  83   0   2
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   0   20  8583  165 55643 3600   94 79480 52248   15  85   0   0
  13   00  2797 2770  178   16   15 82600   1420 100   0   0
  2   42   0   17 14872   11 56646 6201  564 79860 48621   15  83   0   2
  3   18   06 148111 56568 5948  560 80000 48901   16  83   0   2
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  09   0   20  9972  174 55426 4560   97 76670 51057   17  83   0   0
  10   00  2975 2959  400   26   19 79050   3340 100   0   0
  21   02 153414 56767 6176  550 78810 48641   16  82   0   2
  30   00 157541 57430 6455  550 79050 49024   15  83   0   2
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   0   34  9416  175 55902 4018   77 79220 52174   16  84   0   0
  10   01  2840 2738  215   17   14 78000   1750 100   0   0
  21   0  231 153543 57429 6005  521 80990 49924   15  84   0   2
  30   0   16 157671 57634 6274  520 80620 49822   15  84   0   2
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl  usr sys  wt idl
  00   0   23  9166  177 56211 3884   45 80680 52606