Hi Martin & Fabio,
with my system (DFI K6BV3+, K6-400, 256MB, Ditto Max, Ditto Dash DXj) I have
the same problem. Changing ft_fdc_threshold and fdc_ft_fdc_rate_limit didn't
help. The board has of course it's own irq and DMA channel. Ftape produces
continously overrun errors even at a rate of 2000.
The docu says something about buggy DMA implementation in most chipset by
drunken engineers.
Any ideas?
Karsten
----- Original Message -----
From: Martin Jacobs <[EMAIL PROTECTED]>
To: Linux Tape <[EMAIL PROTECTED]>
Sent: Monday, November 29, 1999 11:12 PM
Subject: Re: Overrun errors
> Hi Fabio,
>
> > After a few trial, I've been able to drive my ditto max with the Sept
11th
.
.
.
> >
> > Is there a way to avoid the overruns?
>
> Maybe. It's known that floppy tape drives at high speed
> under a real multiuser environment may be critical in terms of
> timing and bandwidth. Because FTAPE has to feed data in time
> it has to achieve some goals of a realtime OS what Linux not is!
>
> Several months ago there had been reporting of continious feed at
> 3MBit/s with rather powerful machines (Pentium II/III, 350+ MHz).
>
> I for myself had first trouble with a ditto dash board and my
> ditto 2G, but after assigning it it's own DMA and (!) IRQ it
> works reliable. Doing backup with Arkeia I get an average
> throughput of about 12-13MB/min over 30 to 60 minutes. That means
> the tape keeps streaming.
>
> My Linux box is based on an older Socket 7 Triton based m/b and
> operates an IDT WinChip (Centaur) at 200MHz, but my previous
> Pentium/75 worked too.
>
> > ...
>
> Good luck
>
> Martin
>
> --
> Martin Jacobs * Windsbach * [EMAIL PROTECTED] und
> [EMAIL PROTECTED]
> Registered Linux User #87175
>
