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ucx show dev/fu : what is "buffer or I/o waits" ?

 
Wim Van den Wyngaert
Honored Contributor

ucx show dev/fu : what is "buffer or I/o waits" ?

I did an ftp of 90.000 blocks and saw this field going up to 20K.

Wim
Wim
4 REPLIES
Richard Whalen
Honored Contributor

Re: ucx show dev/fu : what is "buffer or I/o waits" ?

This question was asked recently, though it doesn't look like the replies fully answered the poster's question. see http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1067194
Wim Van den Wyngaert
Honored Contributor

Re: ucx show dev/fu : what is "buffer or I/o waits" ?

Richard,

Saw that but it doesn't answer my question.

Wim
Wim
Hoff
Honored Contributor

Re: ucx show dev/fu : what is "buffer or I/o waits" ?

Somebody Wim might be familiar with once posted an old troubleshooting guide here:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=957042

and which is a document with some details on potential remediations -- search the document for the word Waits for details and commands.

I'd re-post the section here, but it's rather longer than an easy cut-and-paste.



Wim Van den Wyngaert
Honored Contributor

Re: ucx show dev/fu : what is "buffer or I/o waits" ?

Hoff,

ucx show comm/mem no longer shows this info when using tcp 5.3. And here it is buffer OR io. I tested it also with a slower network (to avoid waiting on io) and the result was 20K waits too.

I hope someone with source access can tell what it exactly means.

Wim
Wim