Path: utzoo!mnetor!uunet!husc6!hao!ames!amdahl!rtech!llama!daveb
From: daveb@llama.rtech.UUCP (Dave Brower)
Newsgroups: comp.sys.att
Subject: Re: uucp/kermit etc. serial i/o throughput.
Message-ID: <1493@rtech.UUCP>
Date: 22 Dec 87 00:12:40 GMT
References: <1464@rtech.UUCP> <191@toylnd.UUCP>
Sender: news@rtech.UUCP
Reply-To: daveb@llama.UUCP (Dave Brower)
Distribution: na
Organization: Relational Technology, Inc. Alameda, CA
Lines: 39

In article <191@toylnd.UUCP> dca@toylnd.UUCP (David C. Albrecht) writes:
>> Has anyone got any ideas on how to improve this?  What limit am I
>> running into?  Since I do backups from the 7300 to the other machine,
>> and it take about 20 hours to do one with this throughput, even marginal
>> gains would help.
>
>I can't really help you on the throughput.  It is possible you could take
>one of the zmodems that has been posted in the past and it would have better
>results.
>
>If you aren't already, however,
>I would highly suggest that you take the sources for arc or zoo and get
>them running on both ends of the pipe.  'arc'ing or 'zoo'ing the data
>before you transmit it can save you large amounts of time and also make
>it possible to use transmission protocols which don't support wildcarding.
>You can leave the transmitted lump in the arc or zoo and it will take
>up less space on the back-up system as well.

I've already been compressing the input stream.  What _has_ helped is
bumping the speed to 19200, which seems to be giving about half again as
much throughput as 9600.

However, there are side effects:  if a uucico decides to call outgoing
while a transfer is going on using combo-card ports, the combo-card port
can get messed up.  And occasionally the whole 7300 will wedge.  This is
running 3.50.

Can someone correct me?  I am of the impression that serial port
problems were among the reasons for 3.51, but that they weren't really
that much improved.  I am really in no mood to buy a new set of software
to fix a kernel bug.

Thanks,

-dB


"I don't care what you say, as long as you spell my name right."
{amdahl, cbosgd, mtxinu, ptsfa, sun}!rtech!daveb daveb@rtech.uucp