[net-tools-devel] InOctets and OutOctets for IpExt going negative - known issue?

[Rick J. <ric...@hp...>]

Hi -

In looking at some netstat -s output under Ubuntu (11.04 and 11.10) I've 
noticed that under IpExt the InOctets and/or OutOctets are going 
negative.  It looks like something Linux is exporting as a 64-bit 
unsigned value is being parsed as if it were a signed, 32-bit value:

This is what I see in one instance in /proc/net/netstat:

...
IpExt: InNoRoutes InTruncatedPkts InMcastPkts OutMcastPkts InBcastPkts 
OutBcastPkts InOctets OutOctets InMcastOctets OutMcastOctets 
InBcastOctets OutBcastOctets
IpExt: 0 0 611 74 2687 0 146371788 38184167287 106589 5257 313930 0


and from the netstat -s command:
...
IpExt:
     InMcastPkts: 620
     OutMcastPkts: 75
     InBcastPkts: 2707
     InOctets: 146459415
     OutOctets: -470470285
     InMcastOctets: 108486
     OutMcastOctets: 5289
     InBcastOctets: 316740

is this an already known issue?  Looks like there are other octet 
counters being treated as 32-bit unsigned:

raj@tardy:~/netperf2_trunk$ netstat -s | grep backlog
     2317758055 bytes directly in process context from backlog
raj@tardy:~/netperf2_trunk$ netstat -s | grep backlog
     3241897575 bytes directly in process context from backlog
raj@tardy:~/netperf2_trunk$ netstat -s | grep backlog
     3852168807 bytes directly in process context from backlog
raj@tardy:~/netperf2_trunk$ netstat -s | grep backlog
     247754343 bytes directly in process context from backlog

(that was with a loopback netperf TCP_STREAM running)

rick jones