Date: Fri, 9 Oct 1998 23:00:54 +0200 (MET DST) From: Christoph Weber-Fahr <listmail@helena.callcenter.systemhaus.net> To: freebsd-isdn@FreeBSD.ORG Subject: Re: what's wrong with a1 and irq 2 ? Message-ID: <199810092100.XAA10590@helena.otelo-call.de> In-Reply-To: <199810091511.RAA10239@helena.otelo-call.de> from Christoph Weber-Fahr at "Oct 9, 98 05:09:35 pm"
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Hello, following up my own message: I tried it with a changed IRQ. Replaced the 8bit SCSI with an equally bad 16bit version, thus freeing IRQ5, which is now used by the A1. > The bad news is, it indeed seems to compete with the vga card for the > interrupt. It seems to win, though, most of the time - the console > appears sluggish with lag times up to a second (while telnet > access works just fine). This effect is still there. I would conclude that it is not related to the use of IRQ 2/9 and probably caused by the high interrupt load. Is Syscons particularily affected by high interrupt load ? Are other people also experiencing this effect ? I seem to remember from a web page that the i4l folks also had problems with too many interrupts from an A1. > Another observation I made is that the card seems to put a heavy interrupt > load on the machine. Top gives an interrupt load of around 10% while the > card is under load, with occasional (rare) peaks up to 50 %. This is > a 486/50 (ISA only) System. As said above, this problem remains unchanged, which means that ... > Is this a general problem with this card or is the IRQ 2 issue involved > here ? ... this question can be answered with the claim that irq 2 is not involved. I think from this one could conclude that - IRQ2/9 should be supported by the avm driver, maybe there should be a dire warning about obscure VGA cards somewhere in the docs - There is a problem in the AVM driver with a too high interrupt load. I don't think this interrupt stuff is 'normal'. This is eating 10% of the computing power of a 486/50 with only one B channel used. On the other hand I can put the same card into a lousy 386sx/16 and blast 2 simultaneous IDTrans sesssions with full speed over both B channels under good plain old DOS. (I've done that!). There must be some problem in the driver somewhere, which AVM's own DOS CAPI driver doesn't have. > P.S. Should I try to submit a formal 'patch' for the avm driver > to accept IRQ2 (it's utterly trivial) ? Regards Christoph Weber-Fahr To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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