Why M_IOSYS consumes so much memory?

[wm_shi]

Hi Guys,

I ran kmeminfo and got following result:
----------------------------------------------------------------------
Physical memory usage summary (in page/byte/percent):

Physmem = 13983744 53.3g 100% Physical memory
Freemem = 802148 3.1g 6% Free physical memory
Used = 13181596 50.3g 94% Used physical memory
System = 5448501 20.8g 39% By kernel:
Static = 633393 2.4g 5% for text/static data
Dynamic = 1989745 7.6g 14% for dynamic data
Bufcache = 2796748 10.7g 20% for buffer cache
Eqmem = 1237 4.8m 0% for equiv. mapped memory
SCmem = 27378 106.9m 0% for critical memory
User = 7733628 29.5g 55% By user processes:
Uarea = 25260 98.7m 0% for thread uareas
Disowned = 8 32.0k 0% Disowned pages
Bad = 1 4.0k 0% Bad

----------------------------------------------------------------------
Kernel dynamic memory usage (in page/byte/percent):

Dynamic = 1989745 7.6g 14% Kernel dynamic memory
Arenas = 1534703 5.9g 11% Kernel arenas
M_TEMP = 788913 3.0g 6%
M_IOSYS = 262205 1.0g 2%
M_SPINLOCK = 177811 694.6m 1%
M_VXVM = 90066 351.8m 1%
M_DYNAMIC = 69504 271.5m 0%
VFD_BT_NODE = 33809 132.1m 0%
KMEM_ALLOC = 20388 79.6m 0%
ALLOCB_MBLK_LM = 11626 45.4m 0%
M_SWAP = 10952 42.8m 0%
ALLOCB_MBLK_SM = 10138 39.6m 0%
LVM_PBUF = 8540 33.4m 0%
M_PREG = 7678 30.0m 0%
M_REG = 7377 28.8m 0%
VM MISC ARENA = 4129 16.1m 0%
M_KTHREAD = 3653 14.3m 0%
Other = 27914 109.0m 0% Other arenas...
Kalloc = 454711 1.7g 3% kalloc()
SuperPagePool = 134545 525.6m 1% Kernel superpage cache
BufcacheBufs = 257664 1006.5m 2% Buffer cache bufs
BufcacheHash = 40960 160.0m 0% Buffer cache hash heads
Other = 21542 84.1m 0% Other...
Eqalloc = 331 1.3m 0% eqalloc()

It shows that M_IOSYS consumes 1G memory while in other system it just often use several Mega memory.

I have studied some documents about the memory leak and we found the most recent patch is:
PHKL_29039 --> PHKL_32090
PHKL_30044
PHKL_29468 --> PHKL_31227

In our system:
$/usr/sbin/swlist -l product | grep -E 'PHKL_29039|PHKL_32090|PHKL_30044|PHKL_29468 |PHKL_31227'
PHKL_30044 1.0 Memory leak fix for Core Bus ioscan
PHKL_31227 1.0 PCI patch,boot-time HPMC,PCI-X,OLA/R,AGP
PHKL_32090 1.0 SCSI IO Cumulative Patch

The above shows that we should have no memory leak problem in our system.

So is there any further reason for this 1G memory?

Thanks in advance!
William

[harry d brown jr]

is this a continuation of this thread you posted a few weeks ago?

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1009741

live free or die
harry d brown jr

[wm_shi]

Yes, I found there is no reply for many days.
So I start a new thread for this exact question.