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| author |   Gioh Kim <gi-oh.kim@ionos.com> | 2021-04-19 09:37:17 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-04-20 08:59:04 -0600 |
| commit | 015fcf13c41f5dc06132e96540755fcf3f32e72f (patch) | |
| tree | 0791ee0489132b1354a50f3f2263774c264565d2 /Documentation/ABI | |
| parent | block/rnbd-clt: Support polling mode for IO latency optimization (diff) | |
| download | linux-dev-015fcf13c41f5dc06132e96540755fcf3f32e72f.tar.xz linux-dev-015fcf13c41f5dc06132e96540755fcf3f32e72f.zip | |
Documentation/ABI/rnbd-clt: Add description for nr_poll_queues
describe how to set nr_poll_queues and enable the polling
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Link: https://lore.kernel.org/r/20210419073722.15351-15-gi-oh.kim@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-rnbd | 6 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-rnbd-client | 13 |
2 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-rnbd b/Documentation/ABI/testing/sysfs-block-rnbd index ec716e1c31a8..80b420b5d6b8 100644 --- a/Documentation/ABI/testing/sysfs-block-rnbd +++ b/Documentation/ABI/testing/sysfs-block-rnbd @@ -56,3 +56,9 @@ Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> Description: Remap the disconnected device if the session is not destroyed yet. + +What: /sys/block/rnbd<N>/rnbd/nr_poll_queues +Date: Feb 2020 +KernelVersion: 5.7 +Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com> +Description: Contains the number of poll-mode queues diff --git a/Documentation/ABI/testing/sysfs-class-rnbd-client b/Documentation/ABI/testing/sysfs-class-rnbd-client index 2aa05b3e348e..0b5997ab3365 100644 --- a/Documentation/ABI/testing/sysfs-class-rnbd-client +++ b/Documentation/ABI/testing/sysfs-class-rnbd-client @@ -85,6 +85,19 @@ Description: Expected format is the following:: By default "rw" is used. + nr_poll_queues + specifies the number of poll-mode queues. If the IO has HIPRI flag, + the block-layer will send the IO via the poll-mode queue. + For fast network and device the polling is faster than interrupt-base + IO handling because it saves time for context switching, switching to + another process, handling the interrupt and switching back to the + issuing process. + + Set -1 if you want to set it as the number of CPUs + By default rnbd client creates only irq-mode queues. + + NOTICE: MUST make a unique session for a device using the poll-mode queues. + Exit Codes: If the device is already mapped it will fail with EEXIST. If the input |