| Message ID | 1437552576.2783.19.camel@googlemail.com |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/Documentation/IRQ-affinity.txt b/Documentation/IRQ-affinity.txt index 01a6751..d873dab 100644 --- a/Documentation/IRQ-affinity.txt +++ b/Documentation/IRQ-affinity.txt @@ -55,6 +55,11 @@ round-trip min/avg/max = 0.1/0.5/585.4 ms This time around IRQ44 was delivered only to the last four processors. i.e counters for the CPU0-3 did not change. +Note that you have to split the bitmask to chunks when using more that 32 cpus: +[root@moon 44]# echo 80,00000000 > smp_affinity +[root@moon 44]# cat smp_affinity +80,00000000 + Here is an example of limiting that same irq (44) to cpus 1024 to 1031: [root@moon 44]# echo 1024-1031 > smp_affinity_list
It may not be obvious for everyone that bitmasks in proc require 32bit chunking Signed-off-by: Sebastian Poehn <sebastian.poehn@gmail.com> --- Documentation/IRQ-affinity.txt | 5 +++++ 1 file changed, 5 insertions(+)