[Haifux] Missing UDP statistics in recent distributions (RcvbufErrors, SndbufErrors)

[Rami Rosen]

Hi,
 In the linux kernel socket lecture yesterday, I told that
some recent distributions do **not** have the UDP lost packet
statistics of RcvbufErrors, SndbufErrors , since these statistics are
(relatively) new additions to the kernel.

There were some doubts about it and we (unfortunately) did not have
Internet yesterday
in the lecture room.
So , I just want to let you know that I verified what I told you
yesterday. Here
are results on 4 machines: Centos5.2, RHE4, Fedora 7 and Fedora 4. Only the
Fedora 7 had these UDP metrics (RcvbufErrors , SndbufErrors), as you
can see below.
(Please also notice that RHEL or CentOS kernels are older than Fedora kernels.)

I checked the output of:
 cat /proc/net/snmp | grep -i udp in different servers:
on these servers.

====
CentOS release 5.2 (Final) (2.6.18-92.el5)
Udp: InDatagrams NoPorts InErrors OutDatagrams
...
====



====
Red Hat Enterprise Linux ES release 4 (Nahant) (2.6.9-5.ELsmp)
Udp: InDatagrams NoPorts InErrors OutDatagrams
=====


===
Fedora release 7 (Moonshine) (2.6.21-1.3194.fc7)
Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors
===


but in Fedora Core release 4 (Stentz) (2.6.11-1.1369_FC4) , we don't have it:
Udp: InDatagrams NoPorts InErrors OutDatagrams


I wonder what the situation is in Fedora 6. (but don't have access to
such a machine).

Regards,
Rami Rosen