Re: [Xen-users] CPU Temprature

[Ralf Schenk <rs@xxxxxxxxxx>]

S.ÃaÄlar Onur schrieb:
> Hi;
> 
> While using xen-3.0.2 with 2.6.16.28 kernel CPU (Intel(R) Pentium(R) M 
> processor 1.73GHz) temprature is inreasing up to 104 C 
> (/proc/acpi/thermal_zone/THRM/trip_points reports 105 C is critical for CPU) 
> while idle or no domU working with very low system load, and if i 
> start to use domU, sometimes system freezes or reboots for heat.
> 
> But the same kernel just without Xen works normally and not causing any heat 
> problem at all (including on high load).
> 
> Both kernels have ACPI and cpufreq support and according to dmesg output and 
> sysfs values both susbsystems seem works without a problem. What can cause 
> this and how can i debug/solve this issue?
> 

Hello !

I've found a patch on the net that solved the problem for my Athlon64
(Venice) System. I use PowerNow to dynamically adjust CPU-Frequencies.

You have to write your own patch for your Centrino based notebook, and
compile the kernel or the kernel Module again. I don't know if there's a
patch for speedstep-centrino.c available anywhere but it is easy to read
the ssource of the powernow-k8 patch an aplly the same to the
speedstep-centrino.c file.

I attach the really small powernow-k8 patch.

-- 
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Ralf Schenk
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rs@xxxxxxxxxx

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--- 
linux-2.6.16-mtyrel-k8-64bit-xen/arch/i386/kernel/cpu/cpufreq/powernow-k8.c~    
    2006-03-28 13:52:05.553985250 -0500
+++ linux-2.6.16-mtyrel-k8-64bit-xen/arch/i386/kernel/cpu/cpufreq/powernow-k8.c 
2006-03-29 18:30:17.260355500 -0500
@@ -48,6 +48,37 @@
 #define VERSION "version 1.60.0"
 #include "powernow-k8.h"
 
+/* Xen support */
+
+#ifdef CONFIG_XEN_PRIVILEGED_GUEST
+int xen_access_msr(u32 msr, int write, u32* out1, u32* out2, u32 in1, u32 in2) 
{
+       dom0_op_t op;
+       op.cmd = DOM0_MSR;
+  op.u.msr.write = write;
+  op.u.msr.cpu_mask = 1; /* only first CPU: not clear how to read multiple 
CPUs */
+  op.u.msr.msr = msr;
+  op.u.msr.in1 = in1;
+  op.u.msr.in2 = in2;
+       BUG_ON(HYPERVISOR_dom0_op(&op));
+
+  if (!write) {
+    *out1 = op.u.msr.out1; /* low 32 bits */
+    *out2 = op.u.msr.out2; /* high 32 bits */
+  }
+
+  return 0;
+}
+
+#define cpu_rdmsr(msr, val1, val2) xen_access_msr((msr), 0, &(val1), &(val2), 
0, 0)
+#define cpu_wrmsr(msr, val1, val2) xen_access_msr((msr), 1, NULL, NULL, 
(val1), (val2))
+
+#else
+
+#define cpu_rdmsr(msr, val1, val2) rdmsr(msr, val1, val2)
+#define cpu_wrmsr(msr, val1, val2) wrmsr(msr, val1, val2)
+
+#endif
+
 /* serialize freq changes  */
 static DECLARE_MUTEX(fidvid_sem);
 
@@ -98,7 +129,7 @@
 {
        u32 lo, hi;
 
-       rdmsr(MSR_FIDVID_STATUS, lo, hi);
+       cpu_rdmsr(MSR_FIDVID_STATUS, lo, hi);
        return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
 }
 
@@ -116,7 +147,7 @@
                        dprintk("detected change pending stuck\n");
                        return 1;
                }
-               rdmsr(MSR_FIDVID_STATUS, lo, hi);
+               cpu_rdmsr(MSR_FIDVID_STATUS, lo, hi);
        } while (lo & MSR_S_LO_CHANGE_PENDING);
 
        data->currvid = hi & MSR_S_HI_CURRENT_VID;
@@ -145,13 +176,13 @@
        u32 lo, hi;
        u8 fid, vid;
 
-       rdmsr(MSR_FIDVID_STATUS, lo, hi);
+       cpu_rdmsr(MSR_FIDVID_STATUS, lo, hi);
        vid = hi & MSR_S_HI_CURRENT_VID;
        fid = lo & MSR_S_LO_CURRENT_FID;
        lo = fid | (vid << MSR_C_LO_VID_SHIFT);
        hi = MSR_C_HI_STP_GNT_BENIGN;
        dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
-       wrmsr(MSR_FIDVID_CTL, lo, hi);
+       cpu_wrmsr(MSR_FIDVID_CTL, lo, hi);
 }
 
 
@@ -173,7 +204,7 @@
                fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 
        do {
-               wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
+               cpu_wrmsr(MSR_FIDVID_CTL, lo, data->plllock * 
PLL_LOCK_CONVERSION);
                if (i++ > 100) {
                        printk(KERN_ERR PFX "internal error - pending bit very 
stuck - no further pstate changes possible\n");
                        return 1;
@@ -215,7 +246,7 @@
                vid, lo, STOP_GRANT_5NS);
 
        do {
-               wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
+               cpu_wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
                if (i++ > 100) {
                        printk(KERN_ERR PFX "internal error - pending bit very 
stuck - no further pstate changes possible\n");
                        return 1;
@@ -294,7 +325,7 @@
                smp_processor_id(),
                data->currfid, data->currvid, reqvid, data->rvo);
 
-       rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
+       cpu_rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
        maxvid = 0x1f & (maxvid >> 16);
        dprintk("ph1 maxvid=0x%x\n", maxvid);
        if (reqvid < maxvid) /* lower numbers are higher voltages */

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