An IRQ (interrupt request) is the process where a device triggers a hardware interrupt on a processor. When this happens, the processor stops (and saves) the current executing environment, and services the hardware's request. Furthermore, it is possible to prioritize these requests go service some ...

learn more… | top users | synonyms

15
votes
2answers
1k views

Computer architecture: Are USB keyboards less responsive due to narrow IRQ range?

Here is a statement I just thought of. Can anyone tell me whether, and why, it is true? Statement: Because USB keyboards rely on a USB generic driver and architecture that has only access to lower ...
3
votes
2answers
4k views

PS/2 vs USB keyboards: performance and energy consumption

As far as I know, PS/2 keyboards are interrupt driven, while USB are polled. Typically a PS/2 keyboard was assigned IRQ_1 on Windows. I'm no hardware expert, but at a first glance seems like the PS/2 ...
3
votes
1answer
522 views

Sound and Audio devices sharing IRQ numbers, high hardware interrupts, laggy video

After a fresh reinstall of Windows XP SP2, and re installation of my drivers from their official sites, my computer has been experiencing speed problems after a day or so of being on. After opening ...
2
votes
1answer
850 views

IRQ's & interrupt vector table

I have been reading a lot about IRQs, and it seems there is conflicting and out of date information. Some of it dating back to Windows 95. Here is what I'm confused about. Are both software ...
2
votes
4answers
4k views

IRQ problem with 2.6.32/2.6.39 kernel on Debian Squeeze x86_64

I recently assembled a new computer so that all hardware is pretty new. Since then I've been experiencing some problem with IRQs when running Debian 6.0. On random occasions, usually after an hour or ...
2
votes
2answers
228 views

Can I use two of the same type of PCI Sound Cards in one computer?

I recently purchased two Rocketfish 5.1 PCI Sound Cards from Best Buy. These are going to be used for audio production and radio broadcasting, so one card can handle live audio, the other can handle ...
2
votes
1answer
653 views

What is Microsoft ACPI-Compliant System and why are there so many IRQs for it?

I' m a Windows newbie because most of my time I use Linux systems so this question may seem stupid. As far as i know there are only 16 IRQs (0-15) and it is chipset - dependent (APIC controller).But ...
1
vote
0answers
136 views

No irq handler for vector (irq -1)

I recently installed Centos 6.5, however, I am constantly flooded by messages like: Message from syslogd@localhost at May 18 15:38:34 ... kernel:do_IRQ: 0.123 No irq handler for vector (irq -1) I ...
1
vote
0answers
53 views

Clarify misunderstanding about USB hosts and IRQs

I have a long-suffering usb sound card (Creative X-Fi HD). Its manual said the following: Ensure that the headset/soundcard uses a USB Host that is on an individual IRQ slot. This means that no ...
1
vote
0answers
581 views

Serial port IRQ sharing on Linux

I was never able to use two serial ports for I/O on Linux that shared the same IRQ, although the serial driver has "IRQ sharing" enabled. Some BIOS simply don't have enough IRQs to give to each port, ...
0
votes
1answer
53 views

Are IRQs registers?

When a device is assigned an IRQ, does that mean that it has sole access to certain registers associated with that IRQ?
0
votes
2answers
73 views

Frequent BSoD Windows 7

For the past week I have been getting BSoD on my Windows 7 home built PC. It's an old computer, I built it back in 2006 or 2007. I hadn't had trouble with it until now. I have BlueScreenView to ...
0
votes
2answers
969 views

System says memory controller not available and doesn't boot?

Recently I have had a MainBoard-problem. I've send my mainboard to service and today I got it back from the company. It is a Foxconn 520a mainboard. Now I have installed my exchanged mainboard. But ...
0
votes
0answers
18 views

Negative Priority in Top Output

interesting problem: I have four brand new servers with 4, 16-core AMD Opteron 6300 processors that have recently been installed with RHEL 6.2 with the MRG kernel. I'm trying to optimize the servers ...
0
votes
1answer
75 views

Bsod, irq_not_equal, can boot into safe mode

Windows 7 64 bit crashes to bsod, irq_not_equal. I can boot into safe mode but cannot uninstall programs. Error from repair computer on windows installation disc: Root cause found: Unspecified ...
0
votes
0answers
29 views

Linux: Keypresses missed when typed, possibly IRQ issues?

I have a strange behavior on a Raspberry Pi, running a buildroot'ed Linux kernel 3.13.5. When the system comes under a little load (eg. mpd is running in the background happily playing out some ...
0
votes
0answers
215 views

Set smp_affinity_list to use all cores

eth3-rx-0 uses 91% of core26 in my system, I would like to spread the load across all cores, but for some reason only one core is always been used. what I've tried: echo "0-31" > ...
0
votes
1answer
205 views

How to change IRQ priorities on Ubuntu?

I'm trying to figure out how to change the IRQ priorities for devices on Ubuntu (the specific release I have is 11.10). I found this question and answer which says it can be done, but it appears to ...
0
votes
0answers
608 views

How to fix hard lockups (mentioning some IRQ) in my Eeepc laptop (running Linux)?

My EeePC 1015PEM tends to block sometimes (approximately once per 2 days). Even _ cursor in (modesetted) text mode does not blink. After rebooting (unless battery and adaptor was removed) it shows the ...