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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>
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@ -56,3 +56,9 @@ Date: Feb 2020
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KernelVersion: 5.7
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Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
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Description: Remap the disconnected device if the session is not destroyed yet.
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What: /sys/block/rnbd<N>/rnbd/nr_poll_queues
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Date: Feb 2020
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KernelVersion: 5.7
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Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
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Description: Contains the number of poll-mode queues
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@ -85,6 +85,19 @@ Description: Expected format is the following::
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By default "rw" is used.
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nr_poll_queues
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specifies the number of poll-mode queues. If the IO has HIPRI flag,
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the block-layer will send the IO via the poll-mode queue.
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For fast network and device the polling is faster than interrupt-base
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IO handling because it saves time for context switching, switching to
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another process, handling the interrupt and switching back to the
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issuing process.
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Set -1 if you want to set it as the number of CPUs
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By default rnbd client creates only irq-mode queues.
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NOTICE: MUST make a unique session for a device using the poll-mode queues.
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Exit Codes:
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If the device is already mapped it will fail with EEXIST. If the input
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