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From: pitts@mimosa.astro.indiana.edu (Jim Pitts)
Subject: Re: NetBSD - routing and slip
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References: <2gv4lc$l0i@darkstar.UCSC.EDU> <1994Jan12.142552.6187@jupiter.sun.csd.unb.ca>
Date: Wed, 12 Jan 1994 17:07:18 GMT
Lines: 45
In article <1994Jan12.142552.6187@jupiter.sun.csd.unb.ca>,
Peter Howlett <b6ps@jupiter.sun.csd.unb.ca> wrote:
>Wailer at the Gates of Dawn (banshee@cats.ucsc.edu) wrote:
>
>: >}3) Everyonce in a while, I get "/dev/com1: silo overflow" messages.
>: >}They do not appear (in small chunks) to affect anything.
>: >}But get yoo many of them at once, and ver soo all network
>: >}(or maybe just all slip-related) tasks fail with "no buffer space available"
>: Use a 16550 card or (even better) one of the hayes ESP boards. We run
>: netbsd 0.9 with all std silo drivers at 57600 with 28.8 modems and get
>: peaks of >40K with text files. 26K is common with binary files and other
>: net traffic. The ESP board has in/out 1024k buffers and emulates a 16550
>: (albeit with huge buffers).
>
> Another solution not as good as the one above, but less expensive, is
>to get a patch for the com driver from the minnie server at berkeley. It
>was posted last year, so do a general search on 'silo overflow' and there
>will be an article in the list (somewhere) with a patch to com.c.
>
> I use a GVC 14.4k fax modem at home on NetBSD 0.9 with serial 57.6K
>to my school on 16450 serial ports and have'nt had a single silo
>overflow since. On a good day (if the SUN at school is not loaded)
>I can get up to 3000 Chars/Sec on kermit transferring binary (gzip'd) files.
^^^^^^^^^^^^^^ ^^^^^^
>
>My machine by the way is a 386DX/25 w 8M Ram and X running constantly.
>
I find this -very- hard to believe. I have basically the same set up except
that I run FreeBSD, the sio device drivers, have a faster CPU and use zmodem
rather than kermit (I also use ftp with ppp). I am luck to get 1.2 K/s transfer
rate with a 16550A. Either I am doing something drastically wrong or you are
doing something drastically correct.
I realize that the sio drivers are a slow down, and the 'new' kermit is much
more efficent than it used to be ... but a factor of 2 or more?
If this sort of performance is really possbile, I would be intrested in seeing
a discussion on how to get to that level.
--
- pitts@mimosa.astro.indiana.edu ^ | James J. Pitts -
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