* [dts] [PATCH v1] test_plans: add ntb test cases
@ 2019-12-20 5:32 Yinan
2019-12-27 6:05 ` Tu, Lijuan
0 siblings, 1 reply; 2+ messages in thread
From: Yinan @ 2019-12-20 5:32 UTC (permalink / raw)
To: dts; +Cc: Wang Yinan
From: Wang Yinan <yinan.wang@intel.com>
Add ntb cases in ntb_test_plan.rst
Signed-off-by: Wang Yinan <yinan.wang@intel.com>
---
test_plans/ntb_test_plan.rst | 257 +++++++++++++++++++++++++++++++++++
1 file changed, 257 insertions(+)
create mode 100644 test_plans/ntb_test_plan.rst
diff --git a/test_plans/ntb_test_plan.rst b/test_plans/ntb_test_plan.rst
new file mode 100644
index 0000000..5303174
--- /dev/null
+++ b/test_plans/ntb_test_plan.rst
@@ -0,0 +1,257 @@
+.. Copyright (c) <2019>, Intel Corporation
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+
+ - Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ OF THE POSSIBILITY OF SUCH DAMAGE.
+
+==============
+NTB test plan
+==============
+
+The ntb sample application shows how to use ntb rawdev driver.
+This sample provides interactive mode to do packet based processing
+between two systems.
+
+This sample supports 4 types of packet forwarding mode.
+
+* ``file-trans``: transmit files between two systems. The sample will
+ be polling to receive files from the peer and save the file as
+ ``ntb_recv_file[N]``, [N] represents the number of received file.
+* ``rxonly``: NTB receives packets but doesn't transmit them.
+* ``txonly``: NTB generates and transmits packets without receiving any.
+* ``iofwd``: iofwd between NTB device and ethdev.
+
+Command-line Options
+--------------------
+
+The application supports the following command-line options.
+
+* ``--buf-size=N``
+
+ Set the data size of the mbufs used to N bytes, where N < 65536.
+ The default value is 2048.
+
+* ``--fwd-mode=mode``
+
+ Set the packet forwarding mode as ``file-trans``, ``txonly``,
+ ``rxonly`` or ``iofwd``.
+
+* ``--nb-desc=N``
+
+ Set number of descriptors of queue as N, namely queue size,
+ where 64 <= N <= 1024. The default value is 1024.
+
+* ``--txfreet=N``
+
+ Set the transmit free threshold of TX rings to N, where 0 <= N <=
+ the value of ``--nb-desc``. The default value is 256.
+
+* ``--burst=N``
+
+ Set the number of packets per burst to N, where 1 <= N <= 32.
+ The default value is 32.
+
+* ``--qp=N``
+
+ Set the number of queues as N, where qp > 0.
+
+Using the application
+----------------------
+
+The application is console-driven using the cmdline DPDK interface:
+ From this interface the available commands and descriptions of what
+ they do as as follows:
+
+* ``send [filepath]``: Send file to the peer host. Need to be in
+ file-trans forwarding mode first.
+* ``start``: Start transmission.
+* ``stop``: Stop transmission.
+* ``show/clear port stats``: Show/Clear port stats and throughput.
+* ``set fwd file-trans/rxonly/txonly/iofwd``: Set packet forwarding mode.
+* ``quit``: Exit program.
+
+Test Case1: NTB test with file-trans fwd mode using igb_uio
+===========================================================
+
+1. Insmod kernel module and bind Non-Transparent Bridge to igb_uio driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
+ ./usertools/dpdk-devbind.py -b igb_uio ae:00.0
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd file-trans
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd file-trans
+
+4. Send file from Machine1::
+
+ >send xxx # [xxx] is srouce absolute path + file
+
+5. Check file can be received on Machine2 fixed path.
+
+Test Case2: NTB test with file-trans fwd mode using vfio-pci
+============================================================
+
+1. Insmod kernel module and bind Non-Transparent Bridge to vfio-pci driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko
+ insmod vfio-pci
+ lspci -vv -s ae:00.0
+ echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >> /proc/mtrr
+ echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >> /proc/mtrr
+ ./usertools/dpdk-devbind.py -b vfio-pci ae:00.0
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd file-trans
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd file-trans
+
+4. Send file from Machine1::
+
+ >send xxx # [xxx] is srouce absolute path + file
+
+5. Check file can be received on Machine2 fixed path.
+
+Test Case3: NTB test with rxonly/txonly fwd mode using igb_uio
+==============================================================
+
+1. Insmod kernel module and bind Non-Transparent Bridge to igb_uio driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
+ ./usertools/dpdk-devbind.py -b igb_uio ae:00.0
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd rxonly
+ >start
+ >show port stats
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd txonly
+ >start
+ >show port stats
+
+4. Check throughput with log info on two machines.
+
+Test Case4: NTB test with rxonly/txonly fwd mode using vfio-pci
+==============================================================
+
+1. Insmod kernel module and bind Non-Transparent Bridge to vfio-pci driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko
+ insmod vfio-pci
+ lspci -vv -s ae:00.0
+ echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >> /proc/mtrr
+ echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >> /proc/mtrr
+ ./usertools/dpdk-devbind.py -b vfio-pci ae:00.0
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd rxonly
+ >start
+ >show port stats
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
+ >set fwd txonly
+ >start
+ >show port stats
+
+4. Check throughput with log info on two machines.
+
+Test Case5: NTB test with io fwd mode using igb_uio
+===================================================
+Test flow: TG <-> NIC1 <-> NTB1 <-> NTB2 <-> NIC2 <-> TG
+
+1. Insmod kernel module and bind Non-Transparent Bridge and NIC to igb_uio driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
+ ./usertools/dpdk-devbind.py -b igb_uio xx:xx.x # xx:xx.x is NTB
+ ./usertools/dpdk-devbind.py -b igb_uio xx:xx.x # xx:xx.x is NIC
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --burst=32
+ >set fwd iofwd
+ >start
+ >show port stats
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --burst=32
+ >set fwd iofwd
+ >start
+ >show port stats
+
+4. Check throughput with log info on two machines.
+
+Test Case6: NTB test with io fwd mode using vfio-pci
+====================================================
+Test flow: TG <-> NIC1 <-> NTB1 <-> NTB2 <-> NIC2 <-> TG
+
+1. Insmod kernel module and bind Non-Transparent Bridge and NIC to vfio-pci driver on two host machines separately::
+
+ insmod x86_64-native-linuxapp-gcc/kmod/vfio-pci.ko
+ insmod vfio-pci
+ lspci -vv -s ae:00.0
+ echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >> /proc/mtrr
+ echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >> /proc/mtrr
+ ./usertools/dpdk-devbind.py -b vfio-pci xx:xx.x # xx:xx.x is NTB
+ ./usertools/dpdk-devbind.py -b vfio-pci xx:xx.x # xx:xx.x is NIC
+
+2. Launch ntb_fwd sample on Machine1::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --burst=32
+ >set fwd iofwd
+ >start
+ >show port stats
+
+3. Launch ntb_fwd sample on Machine2::
+
+ ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --burst=32
+ >set fwd iofwd
+ >start
+ >show port stats
+
+4. Check throughput with log info on two machines.
\ No newline at end of file
--
2.17.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dts] [PATCH v1] test_plans: add ntb test cases
2019-12-20 5:32 [dts] [PATCH v1] test_plans: add ntb test cases Yinan
@ 2019-12-27 6:05 ` Tu, Lijuan
0 siblings, 0 replies; 2+ messages in thread
From: Tu, Lijuan @ 2019-12-27 6:05 UTC (permalink / raw)
To: Wang, Yinan, dts; +Cc: Wang, Yinan
Applied, thanks
> -----Original Message-----
> From: dts [mailto:dts-bounces@dpdk.org] On Behalf Of Yinan
> Sent: Friday, December 20, 2019 1:33 PM
> To: dts@dpdk.org
> Cc: Wang, Yinan <yinan.wang@intel.com>
> Subject: [dts] [PATCH v1] test_plans: add ntb test cases
>
> From: Wang Yinan <yinan.wang@intel.com>
>
> Add ntb cases in ntb_test_plan.rst
>
> Signed-off-by: Wang Yinan <yinan.wang@intel.com>
> ---
> test_plans/ntb_test_plan.rst | 257
> +++++++++++++++++++++++++++++++++++
> 1 file changed, 257 insertions(+)
> create mode 100644 test_plans/ntb_test_plan.rst
>
> diff --git a/test_plans/ntb_test_plan.rst b/test_plans/ntb_test_plan.rst new
> file mode 100644 index 0000000..5303174
> --- /dev/null
> +++ b/test_plans/ntb_test_plan.rst
> @@ -0,0 +1,257 @@
> +.. Copyright (c) <2019>, Intel Corporation
> + All rights reserved.
> +
> + Redistribution and use in source and binary forms, with or without
> + modification, are permitted provided that the following conditions
> + are met:
> +
> + - Redistributions of source code must retain the above copyright
> + notice, this list of conditions and the following disclaimer.
> +
> + - Redistributions in binary form must reproduce the above copyright
> + notice, this list of conditions and the following disclaimer in
> + the documentation and/or other materials provided with the
> + distribution.
> +
> + - Neither the name of Intel Corporation nor the names of its
> + contributors may be used to endorse or promote products derived
> + from this software without specific prior written permission.
> +
> + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS
> + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
> FITNESS
> + FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
> + COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
> INDIRECT,
> + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
> GOODS OR
> + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> CONTRACT,
> + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
> ADVISED
> + OF THE POSSIBILITY OF SUCH DAMAGE.
> +
> +==============
> +NTB test plan
> +==============
> +
> +The ntb sample application shows how to use ntb rawdev driver.
> +This sample provides interactive mode to do packet based processing
> +between two systems.
> +
> +This sample supports 4 types of packet forwarding mode.
> +
> +* ``file-trans``: transmit files between two systems. The sample will
> + be polling to receive files from the peer and save the file as
> + ``ntb_recv_file[N]``, [N] represents the number of received file.
> +* ``rxonly``: NTB receives packets but doesn't transmit them.
> +* ``txonly``: NTB generates and transmits packets without receiving any.
> +* ``iofwd``: iofwd between NTB device and ethdev.
> +
> +Command-line Options
> +--------------------
> +
> +The application supports the following command-line options.
> +
> +* ``--buf-size=N``
> +
> + Set the data size of the mbufs used to N bytes, where N < 65536.
> + The default value is 2048.
> +
> +* ``--fwd-mode=mode``
> +
> + Set the packet forwarding mode as ``file-trans``, ``txonly``,
> + ``rxonly`` or ``iofwd``.
> +
> +* ``--nb-desc=N``
> +
> + Set number of descriptors of queue as N, namely queue size, where 64
> + <= N <= 1024. The default value is 1024.
> +
> +* ``--txfreet=N``
> +
> + Set the transmit free threshold of TX rings to N, where 0 <= N <=
> + the value of ``--nb-desc``. The default value is 256.
> +
> +* ``--burst=N``
> +
> + Set the number of packets per burst to N, where 1 <= N <= 32.
> + The default value is 32.
> +
> +* ``--qp=N``
> +
> + Set the number of queues as N, where qp > 0.
> +
> +Using the application
> +----------------------
> +
> +The application is console-driven using the cmdline DPDK interface:
> + From this interface the available commands and descriptions of what
> +they do as as follows:
> +
> +* ``send [filepath]``: Send file to the peer host. Need to be in
> + file-trans forwarding mode first.
> +* ``start``: Start transmission.
> +* ``stop``: Stop transmission.
> +* ``show/clear port stats``: Show/Clear port stats and throughput.
> +* ``set fwd file-trans/rxonly/txonly/iofwd``: Set packet forwarding mode.
> +* ``quit``: Exit program.
> +
> +Test Case1: NTB test with file-trans fwd mode using igb_uio
> +===========================================================
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge to igb_uio driver
> on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
> + ./usertools/dpdk-devbind.py -b igb_uio ae:00.0
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd file-trans
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd file-trans
> +
> +4. Send file from Machine1::
> +
> + >send xxx # [xxx] is srouce absolute path + file
> +
> +5. Check file can be received on Machine2 fixed path.
> +
> +Test Case2: NTB test with file-trans fwd mode using vfio-pci
> +============================================================
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge to vfio-pci driver
> on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko
> + insmod vfio-pci
> + lspci -vv -s ae:00.0
> + echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >>
> /proc/mtrr
> + echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >>
> /proc/mtrr
> + ./usertools/dpdk-devbind.py -b vfio-pci ae:00.0
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd file-trans
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd file-trans
> +
> +4. Send file from Machine1::
> +
> + >send xxx # [xxx] is srouce absolute path + file
> +
> +5. Check file can be received on Machine2 fixed path.
> +
> +Test Case3: NTB test with rxonly/txonly fwd mode using igb_uio
> +==============================================================
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge to igb_uio driver
> on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
> + ./usertools/dpdk-devbind.py -b igb_uio ae:00.0
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd rxonly
> + >start
> + >show port stats
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd txonly
> + >start
> + >show port stats
> +
> +4. Check throughput with log info on two machines.
> +
> +Test Case4: NTB test with rxonly/txonly fwd mode using vfio-pci
> +==============================================================
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge to vfio-pci driver
> on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko
> + insmod vfio-pci
> + lspci -vv -s ae:00.0
> + echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >>
> /proc/mtrr
> + echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >>
> /proc/mtrr
> + ./usertools/dpdk-devbind.py -b vfio-pci ae:00.0
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd rxonly
> + >start
> + >show port stats
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --buf-size=65407
> + >set fwd txonly
> + >start
> + >show port stats
> +
> +4. Check throughput with log info on two machines.
> +
> +Test Case5: NTB test with io fwd mode using igb_uio
> +===================================================
> +Test flow: TG <-> NIC1 <-> NTB1 <-> NTB2 <-> NIC2 <-> TG
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge and NIC to
> igb_uio driver on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko wc_activate=1
> + ./usertools/dpdk-devbind.py -b igb_uio xx:xx.x # xx:xx.x is NTB
> + ./usertools/dpdk-devbind.py -b igb_uio xx:xx.x # xx:xx.x is NIC
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --
> burst=32
> + >set fwd iofwd
> + >start
> + >show port stats
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --
> burst=32
> + >set fwd iofwd
> + >start
> + >show port stats
> +
> +4. Check throughput with log info on two machines.
> +
> +Test Case6: NTB test with io fwd mode using vfio-pci
> +====================================================
> +Test flow: TG <-> NIC1 <-> NTB1 <-> NTB2 <-> NIC2 <-> TG
> +
> +1. Insmod kernel module and bind Non-Transparent Bridge and NIC to vfio-
> pci driver on two host machines separately::
> +
> + insmod x86_64-native-linuxapp-gcc/kmod/vfio-pci.ko
> + insmod vfio-pci
> + lspci -vv -s ae:00.0
> + echo "base=0x39bfa0000000 size=0x400000 type=write-combining" >>
> /proc/mtrr
> + echo "base=0x39bfa0000000 size=0x4000000 type=write-combining" >>
> /proc/mtrr
> + ./usertools/dpdk-devbind.py -b vfio-pci xx:xx.x # xx:xx.x is NTB
> + ./usertools/dpdk-devbind.py -b vfio-pci xx:xx.x # xx:xx.x is NIC
> +
> +2. Launch ntb_fwd sample on Machine1::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --
> burst=32
> + >set fwd iofwd
> + >start
> + >show port stats
> +
> +3. Launch ntb_fwd sample on Machine2::
> +
> + ./examples/ntb/build/ntb_fwd -l 28-32 -n 6 -- -i --fwd-mode=iofwd --
> burst=32
> + >set fwd iofwd
> + >start
> + >show port stats
> +
> +4. Check throughput with log info on two machines.
> \ No newline at end of file
> --
> 2.17.1
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