topic Re: Socket Buffer Handling in Operating System - OpenVMS

Socket Buffer Handling

Mainak — Thu, 05 Jan 2006 11:21:44 GMT

Hi ,

Could any one provide me detail information about the following -

UCX> show dev bg1396/fu
Device_socket: bg1396 Type: STREAM LOCAL REMOTE
Port: 23 1216
Host: TGDV12 THDV42
Service: TELNET Terminal: TNA1:

RECEIVE SEND
Queued I/O 0 0
Q0LEN 0 Socket buffer bytes 0 2
QLEN 0 Socket buffer quota 3000 3000
QLIMIT 0 Total buffer alloc 0 1828
TIMEO 0 Total buffer limit 12000 12000
ERROR 0 Number of XONs 0 0
OOBMARK 0 Number of XOFFs 0 0
I/O completed 243 386
Bytes transferred 390 13575

Options: REUSEADR KEEP OOBINLINE
State: ISCONNECTED PRIV
RCV Buff: WAIT
SND Buff: SEL

What is the meaning of the bottom section -

Options: REUSEADR KEEP OOBINLINE
State: ISCONNECTED PRIV
RCV Buff: WAIT
SND Buff: SEL
i.e. -> Option: keep or Option: REUSEADR or RCV Buff: WAIT etc ..

Could any one provide me any document/manual explaing this all for UCX 4.2. I am trying to tune the parameters for better buffer handing as per my system requirements.

Thanks.

Re: Socket Buffer Handling

faris_3 — Fri, 06 Jan 2006 11:40:09 GMT

REUSEADR KEEP OOBINLINE

Hi,

You will find the description of the socket options in
http://h71000.www7.hp.com/doc/82final/6529/6529pro_028.html#app_sock_options

For instance :
SO_REUSEADDR
Specifies that the rules used in validating addresses supplied by a bind() function should allow reuse of local addresses. A value of 0 disables the option, and a non-zero value enables the option. The SO_REUSEPORT option is automatically set when an application sets SO_REUSEADDR.

...

Re: Socket Buffer Handling

Wim Van den Wyngaert — Fri, 06 Jan 2006 11:55:27 GMT

I once asked HP if they had a description of all those fields and they said that "it is common knowledge" t.i. undocumented unless you read the sources.

So, find the sources of a tcp version. Often there is some comment in it. Don't like it myself but it is trendy (open stuff).

Wim

Re: Socket Buffer Handling

Jan van den Ende — Fri, 06 Jan 2006 12:21:32 GMT

... and they said that "it is common knowledge"

Trouble is, by that definition there are not many common people!

Proost.

Have one on me.

jpe