Bug 101467
| Summary: | Polling /proc/acpi/*/state chews up 10-15% of the processor | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | [Retired] Red Hat Linux Beta | Reporter: | John Beimler <john> | ||||||
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> | ||||||
| Status: | CLOSED UPSTREAM | QA Contact: | Brian Brock <bbrock> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | beta1 | CC: | acpi-bugzilla, p.van.egdom, riel | ||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | i386 | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2004-03-25 00:39:01 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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please attach dmesg and output of acpidmp. thanks. Created attachment 93937 [details]
dmesg from the system
Created attachment 93939 [details]
acpidmp from the system
can you try this, the change is in routine 'acpi_pci_link_add':
diff -ur a/drivers/acpi/pci_link.c b/drivers/acpi/pci_
link.c
--- a/drivers/acpi/pci_link.c 2003-08-29 08:53:24.000000000 +0
800
+++ b/drivers/acpi/pci_link.c 2003-09-03 11:37:27.000000000 +0
800
@@ -576,7 +576,11 @@
if (!link->irq.active)
printk(", disabled");
else if (!found)
- printk(", enabled at IRQ %d", link->irq.active);
+ {
+ link->irq.active = 0;
+ acpi_ut_evaluate_object (link->handle, "_DIS", 0, NULL);
+ printk(", disabled");
+ }
printk(")\n");
/* TBD: Acquire/release lock */
This test runs for me in under 1% CPU use on FC2-test1 closing -- please re-open if you still see this issue. thanks, -Len |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5a) Gecko/20030730 Mozilla Firebird/0.6.1 Description of problem: Hardware: Dell Latitude C400 I have noticed that battstat-applet-2 consumes 10-15% of the processor. It appears that it is the polling of the /proc interface that causes it. I have tested this: $ watch "cat /proc/acpi/ac_adapter/AC/state ; cat /proc/acpi/battery/BAT0/state" I then watched the cpu usage every second, and it would fluctuate from around 1%-2% when /proc/acpi entries were not being accessed to 10%-15% when they were. I used top and gnome-system-monitor, if there is a better way to watch this, or other information is needed, let me know. Version-Release number of selected component (if applicable): kernel-2.4.21-20.1.2024.2.1.nptl How reproducible: Always Steps to Reproduce: 1. Monitor ACPI on the laptop, using battstat-applet-2 Actual Results: CPU usage goes way up while the ACPI state is polled. The machine can stall if it is under heavy load when ACPI is polled. xmms may skip, xscreensaver may become jerky and compiles may pause a moment. Expected Results: Less CPU usage. Additional info: