[ENBD] 2.4.32 conclusions

[Peter T. Breuer]

"Also sprach Anders Blomdell:"
> 
> >> Server:
> >>   2012 root      18   0  2064 2064 1612 S 16.0  0.2   0:27.00 enbd-server
> >>   2013 root      10   0  2064 2064 1612 D 11.7  0.2   0:26.95 enbd-server
> >>   2014 root      10   0  2064 2064 1612 D  9.3  0.2   0:26.45 enbd-server
> >>   2011 root       9   0  2064 2064 1612 D  3.3  0.2   0:25.91 enbd-server
> >> servers does a lot of recv's and writes (20-40 MBytes/s)
> >
> > The servers, which are entirely userspace, look in worse shape. Three of 
> > them
> > are starving! They are writing to disk and can't get back acks as fast as 
> > they can
> > write.
> >
>               'D' = uninterruptible sleep
> How does one know that it is not disk-writing that is blocking (20-40 
> MBytes/s
> semms OK for an ide disk)

Actually I don't know what they are in, but since it is something that
apparently can't be interrupted I guessed it is a disk write.  I suppose
they could also be in the service routine of a NIC. But three at once?

Peter