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From: Gioh Kim <gi-oh.kim@ionos.com>
To: linux-block@vger.kernel.org
Cc: axboe@kernel.dk, hch@infradead.org, sagi@grimberg.me,
	bvanassche@acm.org, haris.iqbal@ionos.com, jinpu.wang@ionos.com,
	Gioh Kim <gi-oh.kim@ionos.com>
Subject: [PATCH for-rc 19/24] Documentation/ABI/rnbd-clt: Add description for nr_poll_queues
Date: Thu, 25 Mar 2021 16:29:06 +0100	[thread overview]
Message-ID: <20210325152911.1213627-20-gi-oh.kim@ionos.com> (raw)
In-Reply-To: <20210325152911.1213627-1-gi-oh.kim@ionos.com>

describe how to set nr_poll_queues and enable the polling

Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
---
 Documentation/ABI/testing/sysfs-block-rnbd        |  6 ++++++
 Documentation/ABI/testing/sysfs-class-rnbd-client | 13 +++++++++++++
 2 files changed, 19 insertions(+)

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
-- 
2.25.1


  parent reply	other threads:[~2021-03-25 15:31 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25 15:28 [PATCH for-rc 00/24] Misc update for rnbd Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 01/24] MAINTAINERS: Change maintainer for rnbd module Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 02/24] Documentation/sysfs-block-rnbd: Add descriptions for remap_device and resize Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 03/24] block/rnbd: Enable the fault-injection Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 04/24] block/rnbd-srv: Inject a fault at bio processing Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 05/24] block/rnbd-clt: Inject some fault points Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 06/24] docs: fault-injection: Add fault-injection manual of RNBD Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 07/24] docs: Add RTRS/RNBD to the index of fault-injection Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 08/24] block/rnbd-clt: Remove some arguments from insert_dev_if_not_exists_devpath Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 09/24] block/rnbd-clt: Remove some arguments from rnbd_client_setup_device Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 10/24] block/rnbd-clt: Move add_disk(dev->gd) to rnbd_clt_setup_gen_disk Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 11/24] block/rnbd: Kill rnbd_clt_destroy_default_group Gioh Kim
2021-03-25 15:28 ` [PATCH for-rc 12/24] block/rnbd: Kill destroy_device_cb Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 13/24] block/rnbd-clt: Replace {NO_WAIT,WAIT} with RTRS_PERMIT_{WAIT,NOWAIT} Gioh Kim
2021-03-25 16:12   ` Leon Romanovsky
2021-03-25 16:23     ` Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 14/24] block/rnbd-srv: Prevent a deadlock generated by accessing sysfs in parallel Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 15/24] block/rnbd-srv: Remove force_close file after holding a lock Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 16/24] block/rnbd-clt: Improve find_or_create_sess() return check Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 17/24] block/rnbd-clt: Fix missing a memory free when unloading the module Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 18/24] block/rnbd-clt: Support polling mode for IO latency optimization Gioh Kim
2021-03-25 15:29 ` Gioh Kim [this message]
2021-03-25 15:29 ` [PATCH for-rc 20/24] block/rnbd-srv: Remove unused arguments of rnbd_srv_rdma_ev Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 21/24] block/rnbd-clt: Generate kobject_uevent when the rnbd device state changes Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 22/24] block/rnbd-clt: Remove max_segment_size Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 23/24] block/rnbd-clt-sysfs: Remove copy buffer overlap in rnbd_clt_get_path_name Gioh Kim
2021-03-25 15:29 ` [PATCH for-rc 24/24] block/rnbd: Use strscpy instead of strlcpy Gioh Kim

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