Memory plugin computes wrong apps.value on EM64T linux kernel

The graph before and after new kernel

The same host as posted before (the next day)

Graph booted with em64t kernel yesterday. 6 GB memory commited and increasing.

This also applies to AMD 64bit kernels. Haven't tested with latest-and-greatest yet, though.

$ uname -a Linux donald 2.6.15 #1 Fri Jan 6 17:43:10 CET 2006 x86_64 GNU/Linux

$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 47 model name : AMD Athlon(tm) 64 Processor 3500+ stepping : 2 cpu MHz : 2211.371 cache size : 512 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm bogomips : 4427.37 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc

# munin-run memory slab.value 407457792 swap_cache.value 0 page_tables.value 7958528 vmalloc_used.value 269598720 apps.value -110067712 <------- free.value 43753472 buffers.value 252964864 cached.value 1235300352 swap.value 57344 committed.value 1149820928 mapped.value 176209920 active.value 539652096 inactive.value 1093386240

I am beginning to think that VmallocUsed and SwapCache should not be included in total memory (i.e. stacked and deducted for apps).

I took them out of the stack and the apps formula and I started getting reasonable results from my EMT64T server: http://refraktori.verkkotelakka.net/munin/reflektori/reflektori-memory.html

This was on Linux 2.6.15.1 x86_64.

I have also seen unusual apps value on 2.6.7-1-386 i686 with this meminfo:

 MemTotal:        62396 kB
 MemFree:          2416 kB
 Buffers:           484 kB
 Cached:           7052 kB
 SwapCached:      43136 kB
 Active:          51120 kB
 Inactive:          464 kB
 HighTotal:           0 kB
 HighFree:            0 kB
 LowTotal:        62396 kB
 LowFree:          2416 kB
 SwapTotal:      781160 kB
 SwapFree:       689132 kB
 Dirty:              20 kB
 Writeback:           0 kB
 Mapped:          47412 kB
 Slab:             5488 kB
 Committed_AS:   146776 kB
 PageTables:        568 kB
 VmallocTotal:   974768 kB
 VmallocUsed:      2092 kB
 VmallocChunk:   972432 kB

With official munin the apps value is usually about 2MB but with my patch it rises nearly to 50 MB (which is what I expected since there is a Bind recursor instance). Also with my patch the stack reaches 150 MB which is what 64 MB real + 90 MB swap should be. Earlier the stack reached to only about 110 MB because of the extra SwapCache deduction.

Linux proc documentation and my experiences seem to imply that SwapCache contains resident application data.

My patch is here: http://www.verkkotelakka.net/~jmtapio/munin-memory.patch

I'm testing the plugin without Vmalloctotal on a 32 bit machine to see if the result is also reasonable there.

Nicolai

apps.value seems entirely sane with the Vmalloc removed from the equation.

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