Update README.md

code/DPDK_server_MDcache/README.md

 ## DPDK for Mellanox Bluefield-1 ARM cores 
 
+### Install and configure DPDK
+
 1. Download the required DPDK compressed version & decompress it. 
 
     https://core.dpdk.org/download/
@@ -12,7 +14,7 @@
     a. Check if the Poll Mode Driver (PMD) for your Mellanox NIC is set; in our case it is MLX5 
     b. Add “CONFIG_RTE_LIBRTE_MLX5_PMD=y”, if it does not exist
 
-3. DPDK configuration alternatives
+3. DPDK configuration & alternatives
     - Alternative 1: For newer DPDK versions (>= version 18)
     
         <path-to-dpdk-folder>$ meson build
@@ -22,107 +24,75 @@
         <path-to-dpdk-folder>$ ninja
         
         <path-to-dpdk-folder>$ ninja install
-    
     - Alternative 2: For older DPDK versions & for our mTCP setup
+        - Run: 
             
+            <path-to-dpdk-folder>/usertools$ sudo ./dpdk-setup.sh
+        - Choose 
             
+            7: arm64-bluefield-linuxapp-gcc (NIC installation)
             
+            41: x86_64-native-linuxapp-gcc (Host installation)
             
+            Corresponding folder is created at DPDK root folder
+    - For both alternatives:
+        - Mellanox driver, mlx5 supports kernel and poll mode
+        - No need to unbind the interface from kernel
+        - Allocate huge pages for DPDK operation
             
+            $ sudo sysctl -w vm.nr_hugepages=4096
+        - Test huge page allocation
+            $ cat /proc/meminfo | grep -i huge
 
+**Note: In case of numa.h not found error**
     
+$ sudo apt-get install libnuma-dev
 
-####
-DPDK
-#####
+### Run DPDK application
 
-COMPILE
-vim dpdk/config/common_linuxapp
-#@rinku ADD FOLL
-CONFIG_RTE_LIBRTE_MLX5_PMD=y
+1. Identify PCI address of the NIC port which you want to bind to DPDK 
     
-In case of numa.h not found error
-sudo apt-get install libnuma-dev
+    $ lspci
 
-RUN
-ubuntu@linux:~/dpdk-stable-19.11.8/arm64-bluefield-linuxapp-gcc/build/app/test-pmd$ 
-sudo ./testpmd -w 03:00.1 -- -i -a
-OR
-sudo ./testpmd -- -i -a
+    03:00.0 Ethernet controller: Mellanox Technologies MT416842 BlueField integrated ConnectX-5 network controller => p0 
     
-sudo ./testpmd  -- --nb-cores=2 -i
-testpmd> set fwd txonly
-testpmd> port start 0
-testpmd> port start 1
-testpmd> set eth-peer 0 0c:42:a1:df:ac:41
-testpmd> set eth-peer 1 0c:42:a1:df:ac:40
-testpmd> start
-testpmd> show port stats all
+    03:00.1 Ethernet controller: Mellanox Technologies MT416842 BlueField integrated ConnectX-5 network controller => p1
+2. Run testpmd on the two smartNICs connected directly using a cable
 
-################
-MTCP
-IRON OUT CODE ISSUES
-ubuntu@linux:~/dpdk-stable-19.11.8/arm64-bluefield-linuxapp-gcc/build/app/test-pmd$ sudo ./testpmd -w 03:00.1 -- -i -a
+    <path-to-dpdk-folder>/arm64-bluefield-linuxapp-gcc/build/app/test-pmd$ sudo ./testpmd -w 03:00.1 -- --nb-cores=2 --txq=2 -i 
 
-ubuntu@linux:~/mtcp-devel$ sudo ./setup_mtcp_dpdk_env.sh /home/ubuntu/dpdk-stable-19.11.8
+    **Parameters explained:** 
     
-export RTE_SDK=/home/ubuntu/dpdk-stable-19.11.8
-export RTE_TARGET=arm64-bluefield-linuxapp-gcc
+    w: whitelist device; nb-cores: #forwarding cores; txq: #transmit queues (requires RSS); i: interactive mode; a: automatic traffic start 
 
-wget https://github.com/mtcp-stack/mtcp/archive/refs/heads/devel.zip
+    You can check for more configuration parameters: testpmd> help 
 
-core.c: In function ‘mtcp_create_context’:
-core.c:1332:4: error: ‘lcore_config’ undeclared (first use in this function)
- 1332 |    lcore_config[master].ret = 0;
+3. In the interactive mode, some configurations before testing network bandwidth
 
-ubuntu@linux:~/mtcp-devel$ vim mtcp/src/core.c
-                if (master == whichCoreID(cpu)) {
-                        //@rinku
-                        //lcore_config[master].ret = 0;
-                        //lcore_config[master].state = FINISHED;
+    **I have considered our servers "ub-05" and "user" to demonstrate example configuration**
+    - “ub-05” server smartNIC 
         
-/usr/include/aarch64-linux-gnu/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ output may be truncated copying 1023 bytes from a string of length 1023 [-Werror=stringop-truncation]
-  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
+        testpmd> set fwd txonly 
         
-ubuntu@linux:~/mtcp-devel$ vim mtcp/src/config.c
-        //@rinku
-        //strncpy(optstr, line, MAX_OPTLINE_LEN - 1);
-        memcpy(optstr, line, MAX_OPTLINE_LEN - 1);
+        testpmd> set eth-peer 0 0c:42:a1:df:ac:41
         
-ubuntu@linux:~/mtcp-devel$ vim mtcp/src/io_module.c 
-Comment the funct code for “probe_all_rte_devices” ; add return -1
+        testpmd> set eth-peer 1 0c:42:a1:df:ac:40
 
-COMPILE
+        testpmd> start
         
-export RTE_SDK=/home/ubuntu/dpdk-stable-19.11.8
-export RTE_TARGET=arm64-bluefield-linuxapp-gcc
+        testpmd> show port stats all //repeat 
+    - “user” server smartNIC 
         
-ubuntu@linux:~/mtcp-devel$ ./setup_mtcp_dpdk_env.sh [<path to $RTE_SDK>]
-export RTE_SDK=/home/ubuntu/dpdk-stable-19.11.8
-export RTE_TARGET=arm64-bluefield-linuxapp-gcc
-ubuntu@linux:~/mtcp-devel$./configure --with-dpdk-lib=$RTE_SDK/$RTE_TARGET CFLAGS="-DMAX_CPUS=8" //Specify the max cpus which will run MTCP; use --disable-hwcsum when working in virtualized environment
-ubuntu@linux:~/mtcp-devel$ make
-configure: error: Could not find gmp.h
+        testpmd> set fwd rxonly 
 
-SOLUTION: sudo apt-get install libgmp-dev
+        testpmd> set eth-peer 0 0c:42:a1:df:ac:49
 
+        testpmd> set eth-peer 1 0c:42:a1:df:ac:48
 
-Check the configurations in apps/example
-epserver.conf for server-side configuration
-epwget.conf for client-side configuration
+        testpmd> start
 
-Configure ~/mtcp-devel/apps/example/config/arp.conf
-Configure ~/mtcp-devel/apps/example/config/route.conf
+        testpmd> show port stats all //repeat 
         
-###### 
-RUN THE MTCP APP
-export RTE_SDK=/home/ubuntu/dpdk-stable-19.11.8
-export RTE_TARGET=arm64-bluefield-linuxapp-gcc
 
-sudo ./epserver -p /home/ubuntu/www -f epserver.conf 
-sudo ./epwget 192.168.220.35/example.txt 10000000 -N 8 -c 10000 -f epwget.conf
 
-####### 
-REVERT BACK MTCP NIC CHANGES
-./setup_linux_env.sh [<path to $RTE_SDK>]