Bug 6099

Summary: 2 times IO slowdown in APIC enabled mode
Product: ACPI Reporter: Eugene Seppel (kernelpanic)
Component: Config-OtherAssignee: acpi_config-other
Status: CLOSED DUPLICATE    
Severity: high    
Priority: P2    
Hardware: i386   
OS: Linux   
Kernel Version: 2.6.16-rc4 Subsystem:
Regression: --- Bisected commit-id:
Attachments: Kernel .config
kernel dmesg for this situation
/proc/interrupts

Description Eugene Seppel 2006-02-18 11:41:50 UTC 
Hardware Environment: AMD64, ATI Xpress 200 chipset (Motherboard MS482M4-L)
Software Environment:Linux 2.6.16-rc4, 32 bit

Problem Description:
When ACPI, APIC, Local APIC are enabled in kernel, 2 times Network slowdown
occured. (for example, 80Kb internet connection via 100 Mb NIC, produces only 40
Kb download speed.
Comment 1 Eugene Seppel 2006-02-18 11:42:53 UTC 
Created attachment 7400 [details]
Kernel .config

This is my kernel configuration
Comment 2 Eugene Seppel 2006-02-18 11:43:38 UTC 
Created attachment 7401 [details]
kernel dmesg for this situation
Comment 3 Eugene Seppel 2006-02-18 11:44:08 UTC 
Created attachment 7402 [details]
/proc/interrupts
Comment 4 Shaohua 2006-02-20 18:09:34 UTC 
Please check if timer interrupt runs double speed in APIC mode.
you can do:
cat /proc/interrupts; sleep 1; cat /proc/interrupts
and see the timer interrupt difference between this period.
Comment 5 Eugene Seppel 2006-02-21 04:50:35 UTC 
On Intel P4 with HT the timer interrupt difference equals 101. (This PC works
good in APIC mode, kernel 2.4.26-std-smp-alt13 (From ALTLinux))
On Intel P3 it equals 101 too (This PC works good, without APIC, kernel ~2.2.20)

Today I can't access to that AMD64 PC with troubles.
What should I do if the timer interrupt difference equals 50?

Thank you!
Comment 6 Shaohua 2006-02-22 18:29:09 UTC 
Yes, you can look at:
http://bugzilla.kernel.org/show_bug.cgi?id=3927
Comment 7 Fu Michael 2007-11-07 00:30:20 UTC 
this is clearly a dup of bug# 3927..

*** This bug has been marked as a duplicate of bug 3927 ***