diff --git a/bindings/SigarWrapper.pm b/bindings/SigarWrapper.pm
index 56793a16..84e8dc68 100644
--- a/bindings/SigarWrapper.pm
+++ b/bindings/SigarWrapper.pm
@@ -462,34 +462,44 @@ use vars qw(%classes %cmds);
       {
          name => 'vendor', type => 'String',
          desc => 'CPU vendor id',
-         plat => 'AFLHSW'
+         plat => '*'
       },
       {
          name => 'model', type => 'String',
          desc => 'CPU model',
-         plat => 'AFLHSW'
+         plat => '*'
       },
       {
          name => 'mhz', type => 'Int',
-         desc => 'CPU speed',
-         plat => 'AFHLSW'
+         desc => 'Current CPU speed',
+         plat => '*'
+      },
+      {
+         name => 'mhz_max', type => 'Int',
+         desc => 'Maximum CPU speed',
+         plat => 'DL'
+      },
+      {
+         name => 'mhz_min', type => 'Int',
+         desc => 'Maximum CPU speed',
+         plat => 'DL'
       },
       {
          name => 'cache_size', type => 'Long',
          desc => 'CPU cache size',
-         plat => 'AL'
+         plat => 'ADL'
       },
       {
-	  name => 'total_cores', type => 'Int',
-	  desc => 'Total CPU cores (logical)',
+         name => 'total_cores', type => 'Int',
+         desc => 'Total CPU cores (logical)',
       },
       {
-	  name => 'total_sockets', type => 'Int',
-	  desc => 'Total CPU sockets (physical)',
+         name => 'total_sockets', type => 'Int',
+         desc => 'Total CPU sockets (physical)',
       },
       {
-	  name => 'cores_per_socket', type => 'Int',
-	  desc => 'Number of CPU cores per CPU socket',
+         name => 'cores_per_socket', type => 'Int',
+         desc => 'Number of CPU cores per CPU socket',
       },
     ],
     Uptime => [
@@ -2065,8 +2075,8 @@ EOF
         my $member = $field->{member} || $name;
         my $desc = $field->{desc} || $name;
         (my $jname = $name) =~ s/_(\w)/\u$1/g;
-	my $getter = "get\u$jname";
-	$jname = jname($jname);
+        my $getter = "get\u$jname";
+        $jname = jname($jname);
         my $sig = qq("$field_types{$type}");
         my $set = "JENV->Set${type}Field";
         my $get = "JENV->Get${type}Field";
diff --git a/bindings/ruby/examples/cpu_info.rb b/bindings/ruby/examples/cpu_info.rb
index f68a5a80..a38dec8d 100644
--- a/bindings/ruby/examples/cpu_info.rb
+++ b/bindings/ruby/examples/cpu_info.rb
@@ -11,6 +11,8 @@ puts num.to_s + " total CPUs.."
 infos.each do |info|
     puts "Vendor........" + info.vendor
     puts "Model........." + info.model
-    puts "Mhz..........." + info.mhz.to_s
+    puts "Current Mhz..." + info.mhz.to_s
+    puts "Maximum Mhz..." + info.mhz_max.to_s
+    puts "Minimum Mhz..." + info.mhz_min.to_s
     puts "Cache size...." + info.cache_size.to_s
 end
diff --git a/include/sigar.h b/include/sigar.h
index b06a01ed..d0e46730 100644
--- a/include/sigar.h
+++ b/include/sigar.h
@@ -188,6 +188,8 @@ typedef struct {
     char vendor[128];
     char model[128];
     int mhz;
+    int mhz_max;
+    int mhz_min;
     sigar_uint64_t cache_size;
     int total_sockets;
     int total_cores;
diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 38c80958..43baaa3b 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -2237,6 +2237,8 @@ int sigar_file_system_usage_get(sigar_t *sigar,
 
 #ifdef DARWIN
 #define CTL_HW_FREQ "hw.cpufrequency"
+#define CTL_HW_FREQ_MAX "hw.cpufrequency_max"
+#define CTL_HW_FREQ_MIN "hw.cpufrequency_min"
 #else
 /* XXX FreeBSD 5.x+ only? */ 
 #define CTL_HW_FREQ "machdep.tsc_freq"
@@ -2246,7 +2248,7 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
                             sigar_cpu_info_list_t *cpu_infos)
 {
     int i;
-    unsigned int mhz;
+    unsigned int mhz, mhz_min, mhz_max;
     int cache_size=SIGAR_FIELD_NOTIMPL;
     size_t size;
     char model[128], vendor[128], *ptr;
@@ -2257,24 +2259,48 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
 
 #if defined(DARWIN)
     {
-        int mib[] = { CTL_HW, HW_CPU_FREQ };
+        int mib[2];
+        mib[0] = CTL_HW;
+
+        mib[1] = HW_CPU_FREQ;
         size = sizeof(mhz);
         if (sysctl(mib, NMIB(mib), &mhz, &size, NULL, 0) < 0) {
             mhz = SIGAR_FIELD_NOTIMPL;
         }
+        mib[1] = HW_CPU_FREQ_MAX;
+        size = sizeof(mhz_max);
+        if (sysctl(mib, NMIB(mib), &mhz_max, &size, NULL, 0) < 0) {
+            mhz_max = SIGAR_FIELD_NOTIMPL;
+        }
+        mib[1] = HW_CPU_FREQ_MIN;
+        size = sizeof(mhz_min);
+        if (sysctl(mib, NMIB(mib), &mhz_max, &size, NULL, 0) < 0) {
+            mhz_min = SIGAR_FIELD_NOTIMPL;
+        }
     }
 #elif defined(__FreeBSD__)
     if (sysctlbyname(CTL_HW_FREQ, &mhz, &size, NULL, 0) < 0) {
         mhz = SIGAR_FIELD_NOTIMPL;
     }
+    /* TODO */
+    mhz_max = SIGAR_FIELD_NOTIMPL;
+    mhz_min = SIGAR_FIELD_NOTIMPL;
 #else
     /*XXX OpenBSD*/
     mhz = SIGAR_FIELD_NOTIMPL;
+    mhz_max = SIGAR_FIELD_NOTIMPL;
+    mhz_min = SIGAR_FIELD_NOTIMPL;
 #endif
 
     if (mhz != SIGAR_FIELD_NOTIMPL) {
         mhz /= 1000000;
     }
+    if (mhz_max != SIGAR_FIELD_NOTIMPL) {
+        mhz_max /= 1000000;
+    }
+    if (mhz_min != SIGAR_FIELD_NOTIMPL) {
+        mhz_min /= 1000000;
+    }
 
     size = sizeof(model);
 #ifdef __OpenBSD__
@@ -2297,6 +2323,14 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
         /* freebsd4 */
         mhz = sigar_cpu_mhz_from_model(model);
     }
+    /* XXX not sure */
+    if (mhz_max == SIGAR_FIELD_NOTIMPL) {
+        mhz_max = 0;
+    }
+    if (mhz_min == SIGAR_FIELD_NOTIMPL) {
+        mhz_min = 0;
+    }
+
 
 #ifdef DARWIN
     size = sizeof(vendor);
@@ -2351,6 +2385,8 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
         sigar_cpu_model_adjust(sigar, info);
 
         info->mhz = mhz;
+        info->mhz_max = mhz_max;
+        info->mhz_min = mhz_min;
         info->cache_size = cache_size;
         info->total_cores = sigar->ncpu;
         info->cores_per_socket = sigar->lcpu;
diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index 1d3a9e1e..008c9bc3 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -1598,7 +1598,23 @@ static void get_cpuinfo_max_freq(sigar_cpu_info_t *cpu_info, int num)
         sigar_file2str(max_freq, max_freq, sizeof(max_freq)-1);
 
     if (status == SIGAR_OK) {
-        cpu_info->mhz = atoi(max_freq) / 1000;
+        cpu_info->mhz_max = atoi(max_freq) / 1000;
+    }
+}
+
+static void get_cpuinfo_min_freq(sigar_cpu_info_t *cpu_info, int num)
+{
+    int status;
+    char min_freq[PATH_MAX];
+    snprintf(min_freq, sizeof(min_freq),
+             "/sys/devices/system/cpu/cpu%d"
+             "/cpufreq/cpuinfo_min_freq", num);
+
+    status =
+        sigar_file2str(min_freq, min_freq, sizeof(min_freq)-1);
+
+    if (status == SIGAR_OK) {
+        cpu_info->mhz_min = atoi(min_freq) / 1000;
     }
 }
 
@@ -1624,6 +1640,7 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
 
         info = &cpu_infos->data[cpu_infos->number];
         get_cpuinfo_max_freq(info, cpu_infos->number);
+        get_cpuinfo_min_freq(info, cpu_infos->number);
 
         info->total_cores = sigar->ncpu;
         info->cores_per_socket = sigar->lcpu;