Messages in this thread Patch in this message | | | Date | Mon, 12 Jan 2004 08:10:25 -0800 | From | "Martin J. Bligh" <> | Subject | Re: 2.6.1 and irq balancing |
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> How much is significant? The term doesn't really help much. I will say that with one NIC taking 120MB/sec of data to a TB database and copying to two other machine (~220MB) my interrupts got up in in the 5k-12k range with essentially CPU0 doing the work, some few percent going to CPU2.
1010 per second, IIRC. Try this patch:
diff -aurpN -X /home/fletch/.diff.exclude 290-gfp_node_strict/arch/i386/kernel/io_apic.c 310-irqbal_fast/arch/i386/kernel/io_apic.c --- 290-gfp_node_strict/arch/i386/kernel/io_apic.c Fri Jan 9 22:25:48 2004 +++ 310-irqbal_fast/arch/i386/kernel/io_apic.c Fri Jan 9 22:27:55 2004 @@ -401,7 +401,7 @@ static void do_irq_balance(void) unsigned long max_cpu_irq = 0, min_cpu_irq = (~0); unsigned long move_this_load = 0; int max_loaded = 0, min_loaded = 0; - unsigned long useful_load_threshold = balanced_irq_interval + 10; + unsigned long useful_load_threshold = balanced_irq_interval / 10; int selected_irq; int tmp_loaded, first_attempt = 1; unsigned long tmp_cpu_irq; M.
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