sockets overflow

[Elizabeth Levin]

I have a few hp unix boxes running 10.20
when doing an nestat -s |grep overflow
I am seeing a huge amounts of socket overflows
how do I fix this..
on some other boxes - also 10.20 there are
zero overflows...

thanks

[A. Clay Stephenson · Accepted solution]

Hi Elizabeth:

You don't give us a lot to go on but I have seen that error on 10.20 boxes that are configured as NFS servers. In that case,

edit /etc/rc.config.d/nfsconf and increase NUM_NFSD and NUM_NFSIOD. The default for both of these is four; I would first increase it 16.
Next /sbin/init.d/nfs.server stop and then /sbin/init.d/nfs.server start.

Hope this fixes your wagon, Clay

[Sanjay_6]

Hi Elizabeth,

Have a look at the thread below.

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=9f8da213050b496d36/screen=ckiDisplayDocument?docId=200000042773864

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=9f8da213050b496d36/screen=ckiDisplayDocument?docId=200000054496925

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=9f8da213050b496d36/screen=ckiDisplayDocument?docId=200000024625405

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=9f8da213050b496d36/screen=ckiDisplayDocument?docId=200000056243682

You can also load these two patches.

s700_800 10.20 NFS/NIS cumulative Megapatch (PHNE_22288)
s700_800 10.20 NFS Kernel General Rel & Perf Patch (PHNE_22877)

Hope this helps.

thanks

[rick jones]

"huge" is a relative thing. you need to guesstimate how many non-overflows there have been. there may be a UDP MIB variable you cna query with something like snmpget/snmpwalk, or you can guess by looking at the ip stats, and subtracting-out the tcp segments from the tcp stats.

in general, a udp socket buffer overflow implies that the recieving application did not "keep up" for some period of time. i suspect that those links in the other replies will talk about things like that.

[Sanjay_6]

Hi Elizabeth,

Here is something for you to read.

http://us-support.external.hp.com/cki/bin/doc.pl/sid=b677096f16e35ba59b/screen=ckiDisplayDocument?docId=200000055052551

http://us-support.external.hp.com/cki/bin/doc.pl/sid=b677096f16e35ba59b/screen=ckiDisplayDocument?docId=200000056243682

http://us-support.external.hp.com/cki/bin/doc.pl/sid=b677096f16e35ba59b/screen=ckiDisplayDocument?docId=200000055953972

You may also look for some networking patches you might be missing.

Hope this helps.

thanks

[Mladen Despic]

Elizabeth,

If it is NFS, then the links and suggestions mentioned above should help.

I've seen, however, another (third party) application causing UDP socket overflows. The vendor went on to create a patch for this app in order to fix the problem.

If you are not sure what app is causing socket overflows, you can try using lsof (look for large queues).

Regards ... Mladen