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From: "Kathy Frazier" <>
To: "Andi Kleen" <>, <>
Subject: RE: Interrupt doesn't make it to the 8259 on a ASUS P4PE mobo
Date: Tue, 15 Jul 2003 11:14:16 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Thanks for your reply, Andi.

>> We have a proprietary PCI board installed in a (UP) system with an ASUS
>> motherboard (uses Intel 845PE chipset). This system is running Red Hat

>Have you checked the 845 errata sheets on the Intel website?
>Perhaps it is some known hardware bug.

>One thing you could try is to use Local APIC / IO APIC interrupt processing
>instead of 8259.

Our hardware engineer has combed the Intel and ASUS websites, but found
nothing.  I'll give the APIC a try and see if I get different results and
let you know.

>> /* start timer */
>> dmatimer.expires = jiffies + 0.5*HZ;

>That's a serious bug. You cannot use floating point in the kernel.
>It will corrupt the FP state of the user process.

HZ on the INTEL platform is 100, so this should simply add 50 to the current
value of jiffies.  Besides, assigning the value to the unsigned int field
(expires) will truncate it to an integer anyway.  Is there a more
appropriate way to handle a short timeout?


       reply	other threads:[~2003-07-15 14:48 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2003-07-15 16:14 ` Kathy Frazier [this message]
2003-07-15 15:31   ` Richard B. Johnson
2003-07-15 15:58     ` SCSI ATA driver in 2.4.22 ? Jeff Mock
2003-07-15 16:14       ` Jeff Garzik
2003-07-15 17:06   ` Interrupt doesn't make it to the 8259 on a ASUS P4PE mobo Brian Gerst
2003-07-15 17:43     ` Jamie Lokier
2003-07-15 17:59     ` Luciano Miguel Ferreira Rocha
2003-07-15 18:24       ` Brian Gerst
2003-07-15 18:44         ` Alan Cox
2003-07-15 19:44           ` Jamie Lokier
2003-07-20 21:04           ` Riley Williams
2003-07-20 22:25             ` Jeremy Fitzhardinge
     [not found] <Pine.LNX.4.53.0307141833190.4354@chaos>
2003-07-15 16:52 ` Kathy Frazier
2003-07-14 21:35 Kathy Frazier

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