diff options
Diffstat (limited to 'Documentation/block/queue-sysfs.txt')
| -rw-r--r-- | Documentation/block/queue-sysfs.txt | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/block/queue-sysfs.txt b/Documentation/block/queue-sysfs.txt index f65274081c8d..d8147b336c35 100644 --- a/Documentation/block/queue-sysfs.txt +++ b/Documentation/block/queue-sysfs.txt | |||
| @@ -45,9 +45,13 @@ device. | |||
| 45 | 45 | ||
| 46 | rq_affinity (RW) | 46 | rq_affinity (RW) |
| 47 | ---------------- | 47 | ---------------- |
| 48 | If this option is enabled, the block layer will migrate request completions | 48 | If this option is '1', the block layer will migrate request completions to the |
| 49 | to the CPU that originally submitted the request. For some workloads | 49 | cpu "group" that originally submitted the request. For some workloads this |
| 50 | this provides a significant reduction in CPU cycles due to caching effects. | 50 | provides a significant reduction in CPU cycles due to caching effects. |
| 51 | |||
| 52 | For storage configurations that need to maximize distribution of completion | ||
| 53 | processing setting this option to '2' forces the completion to run on the | ||
| 54 | requesting cpu (bypassing the "group" aggregation logic). | ||
| 51 | 55 | ||
| 52 | scheduler (RW) | 56 | scheduler (RW) |
| 53 | -------------- | 57 | -------------- |