Odd network issues on ZFS based NFS server

[Anders Nordby]

Hi,

On Thu, Jun 10, 2010 at 06:17:10PM +1000, Peter Jeremy wrote:
> I wonder if your system is running out of free RAM.  How would you
> like to monitor "inactive", "cache" and "free" from either "systat -v"
> or "vmstat -s" whilst the problem is occurring.
> 
> Does something like
>   perl -e '$x = "x" x 10000000;'
> temporarily correct the problem?

While the problem is happening:

root at unixfile:~# vmstat -s
511745441 cpu context switches
151635080 device interrupts
 14028218 software interrupts
 11549957 traps
974939023 system calls
       22 kernel threads created
    77512  fork() calls
     6097 vfork() calls
        0 rfork() calls
        0 swap pager pageins
        0 swap pager pages paged in
        0 swap pager pageouts
        0 swap pager pages paged out
      699 vnode pager pageins
     4777 vnode pager pages paged in
     2024 vnode pager pageouts
     2471 vnode pager pages paged out
        0 page daemon wakeups
        0 pages examined by the page daemon
      318 pages reactivated
  4738808 copy-on-write faults
     4957 copy-on-write optimized faults
  3843376 zero fill pages zeroed
        0 zero fill pages prezeroed
     2273 intransit blocking page faults
 11236873 total VM faults taken
        0 pages affected by kernel thread creation
 20699066 pages affected by  fork()
  1707164 pages affected by vfork()
        0 pages affected by rfork()
      363 pages cached
 27229532 pages freed
        0 pages freed by daemon
  6618712 pages freed by exiting processes
     6054 pages active
    37307 pages inactive
       28 pages in VM cache
   261148 pages wired down
   456560 pages free
     4096 bytes per page
 43744208 total name lookups
          cache hits (19% pos + 1% neg) system 0% per-directory
          deletions 2%, falsehits 0%, toolong 0%

And from systat -v:

Disks   da0   da1 pass0 pass1                     1045240 wire
KB/t   0.00  0.00  0.00  0.00                       25240 act
tps       0     0     0     0                      149344 inact
MB/s   0.00  0.00  0.00  0.00                         112 cache
%busy     0     0     0     0                     1824452 free
                                                   323680 buf
> Does something like
>   perl -e '$x = "x" x 10000000;'
> temporarily correct the problem?

No.

Regards,

-- 
Anders.