Date: Wed, 7 Jun 95 18:44:06 EDT From: jleppek@suw2k.ess.harris.com (James Leppek) To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-hackers@freefall.cdrom.com Subject: Re: silo overflows Message-ID: <9506072244.AA21412@borg.ess.harris.com>
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The floppy is not on the adaptec, only a little used drive and an exabyte tape drive for backups (which were not being dome). I have changed sio.c and will see if the problem goes away with the trigger at 8. Since this has been seen by others when X is running could it have something to do with the mouse events getting buffered up and those interrupts getting served first. I seem to recall port 0 interrupts at a higher level than 1 (irq 4 > irq 3). just checked already had an overflow .... darn .. Oh well, only a few an hour, guess I will try to see what happens at 115200 to see if it is rate sensitive. Jim > From owner-freebsd-hackers@freefall.cdrom.com Wed Jun 7 17:56:49 1995 > From: J Wunsch <j@uriah.heep.sax.de> > Subject: Re: silo overflows > To: jleppek@suw2k.ess.harris.com (James Leppek) > Date: Wed, 7 Jun 1995 23:31:45 +0200 (MET DST) > Cc: freebsd-hackers@freefall.cdrom.com > Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) > X-Phone: +49-351-2012 669 > X-Mailer: ELM [version 2.4 PL23] > Mime-Version: 1.0 > Content-Type> : > text/plain> ; > charset=ISO-8859-1> > Content-Transfer-Encoding: 8bit > Sender: hackers-owner@FreeBSD.org > > As James Leppek wrote: > > > > The only bus hogging DMA I could think of is the 1542CF but it is > > at the default settings which I thought were safe. > > Adaptec's 154X controllers are the most `famous' bus hogs. They do > also cause all sort of troubles with floppy DMA operations (even > though the FDC DMA overrun conditions are hidden from the user, but > you will notice a _drastical_ floppy throughput drop when doing > simultaneous operations on an AHA-154X controlled SCSI bus). > > -- > cheers, J"org > > joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ > Never trust an operating system you don't have sources for. ;-) >
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