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.
Created attachment 7400 [details] Kernel .config This is my kernel configuration
Created attachment 7401 [details] kernel dmesg for this situation
Created attachment 7402 [details] /proc/interrupts
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.
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!
Yes, you can look at: http://bugzilla.kernel.org/show_bug.cgi?id=3927
this is clearly a dup of bug# 3927.. *** This bug has been marked as a duplicate of bug 3927 ***