From 3e59f81ea589d3d4b342849b01df4a5cb48ee5a4 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 9 Feb 2015 09:26:10 +0000
Subject: [PATCH] scripts/spread-mlx4-ib-interrupts: Add to repository

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6027 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scripts/spread-mlx4-ib-interrupts | 55 +++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100755 scripts/spread-mlx4-ib-interrupts

diff --git a/scripts/spread-mlx4-ib-interrupts b/scripts/spread-mlx4-ib-interrupts
new file mode 100755
index 000000000..6c61766df
--- /dev/null
+++ b/scripts/spread-mlx4-ib-interrupts
@@ -0,0 +1,55 @@
+#!/bin/awk -f
+
+BEGIN {
+  if (debug != "")
+    print "[<node>, <per_node_cpu_idx>]: <cpu>";
+  "ls -1d /sys/devices/system/node/node* 2>&1 | wc -l" | getline nodes
+  if (nodes > 1) {
+    for (i = 0; i < nodes; i++) {
+      cpus_per_node = 0
+      while (("cd /sys/devices/system/cpu && ls -d cpu*/node" i " | sed 's/^cpu//;s,/.*,,'|sort -n" | getline j) > 0) {
+	if (debug != "")
+	  print "[" i ", " cpus_per_node "]: " j
+        cpu[i, cpus_per_node++] = j
+      }
+    }
+  } else {
+    cpus_per_node = 0
+    while (("cd /sys/devices/system/cpu && ls -d cpu[0-9]* | sed 's/^cpu//'|sort -n" | getline j) > 0) {
+      if (debug != "")
+	print "[0, " cpus_per_node "]: " j
+      cpu[0, cpus_per_node++] = j
+    }
+  }
+  for (i = 0; i < nodes; i++)
+      nextcpu[i] = 0
+  while (("sed -n 's/.*mlx4-ib-\\([0-9]*\\)-[0-9]*@\\(.*\\)$/\\1 \\2/p' /proc/interrupts | uniq" | getline) > 0) {
+    port = $1
+    bus = substr($0, length($1) + 2)
+    if (debug != "")
+      print "HCA port = " port "; bus = " bus
+    irqcount = 0
+    while (("sed -n 's/^[[:blank:]]*\\([0-9]*\\):[0-9[:blank:]]*[^[:blank:]]*[[:blank:]]*\\(mlx4-ib-" port "-[0-9]*@" bus "\\)$/\\1 \\2/p' </proc/interrupts" | getline) > 0) {
+      irq[irqcount] = $1
+      irqname[irqcount] = substr($0, length($1) + 2)
+      irqcount++
+    }
+    for (i = 0; i < nodes; i++) {
+      ch_start = i * irqcount / nodes
+      ch_end = (i + 1) * irqcount / nodes
+      for (ch = ch_start; ch < ch_end; ch++) {
+        c = cpu[i, nextcpu[i]++ % cpus_per_node]
+        if (nodes > 1)
+            nodetxt =  " (node " i ")"
+        else
+            nodetxt = ""
+        print "IRQ " irq[ch] " (" irqname[ch] "): CPU " c nodetxt
+        cmd="echo " c " >/proc/irq/" irq[ch] "/smp_affinity_list"
+	if (debug != "")
+	  print cmd
+	system(cmd)
+      }
+    }
+  }
+  exit 0
+}