High TLB shootdown I interrupts with wm gigabit NIC?

[Mark Cullen <mark.r.cullen%gmail.com@localhost>]

I just got a Intel Pro/1000 PT PCI-E NIC and am pleased that it actually 
seems to be working. However, I would just like to check if the 
following is considered normal.

Firstly, transfer rates are "only" about 30MB/s, both with Samba and by 
FTP. This is in both directions. This seems a bit low?

Secondly, I have noticed that whilst idle "TLB shootdown I" (there are 
two of these, dual core, I believe this is the one for CPU #1) is next 
to nothing. It'll go up to 5 every so often and then just not register 
for the rest of the time. Whilst doing an FTP... it  goes through the roof:

    2 users    Load  0.00  0.00  0.00                  Tue Jul 29
 21:20:16
Proc:r  d  s  w     Csw    Trp    Sys   Int   Sof    Flt      PAG
ING       17       7235   3289   9003  6141   296   3108      in
 out   in  out                                          ops
  15.2% Sy   0.2% Us   0.0% Ni  20.3% In  64.3% Id    pages
|    |    |    |    |    |    |    |    |    |    |
========%%%%%%%%%%

           memory totals (in kB)           30183 Interrupts
          real  virtual     free             100 cpu0 softclock
Active  675484   675484   987572            3017 cpu0 softnet
All    1040336  1040336  2036144             100 cpu0 timer
                                                 FPU flush IPI
Namei         Sys-cache     Proc-cache         1 FPU synch IPI
    Calls     hits    %     hits     %       174 TLB shootdown I
        6        6  100                          cpu1 softnet
                                             100 cpu1 timer
      23eeks xfers bytes %busy                   FPU flush IPI
      64                                         FPU synch IPI
      85                                   20550 TLB shootdown I
   wd1         988   33M  37.0                   ioapic0 pin 1
    1548                                    4642 ioapic0 pin 16
   wd3         988   33M  37.0                   ioapic0 pin 23
 raid7                                      1499 ioapic0 pin 19
 raid1         525   33M  39.7                   ioapic0 pin 18

Is this normal? It seems a bit high?!
--
Mark Cullen <mark.r.cullen%gmail.com@localhost>