[ASA5508] MEMPOOL_HEAPCACHE_0 2% free
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01-29-2021 03:54 AM
Hi,
Our monitoring is showing MEMPOOL_HEAPCACHE_0 2% free
Can anybody explain to me what it means and how i can fix the issue:
sh ver
Cisco Adaptive Security Appliance Software Version 9.8(4)25 Firepower Extensible Operating System Version 2.2(2.124) Device Manager Version 7.12(2) Compiled on Mon 06-Jul-20 07:56 PDT by builders System image file is "disk0:/asa984-25-lfbff-k8.SPA" Config file at boot was "startup-config" Port-ASA1 up 189 days 18 hours failover cluster up 2 years 231 days Hardware: ASA5508, 8192 MB RAM, CPU Atom C2000 series 2000 MHz, 1 CPU (8 cores ) Internal ATA Compact Flash, 8000MB BIOS Flash M25P64 @ 0xfed01000, 16384KB
sh mem detail
Heap Memory:
Free Memory:
Heapcache Pool: 3262736 bytes ( 0% )
Global Shared Pool: 134416 bytes ( 0% )
System: 3228862604 bytes ( 74% )
Used Memory:
Heapcache Pool: 309212912 bytes ( 7% )
Global Shared Pool: 752 bytes ( 0% )
Reserved (Size of DMA Pool): 499122176 bytes ( 11% )
Reserved for messaging: 2097152 bytes ( 0% )
MMAP usage: 87224580 bytes ( 2% )
System Overhead: 250695420 bytes ( 6% )
------------------------------------- ----------------
Total Memory: 4380612748 bytes ( 100% )
Warning: The information reported here is computationally expensive to
determine, and may result in CPU hogs and performance impact.
-----------------------------------------------------------------------
MEMPOOL_MSGLYR POOL STATS:
Non-mmapped bytes allocated = 2097152
Number of free chunks = 1
Number of mmapped regions = 0
Mmapped bytes allocated = 0
Max memory footprint = 2097152
Keepcost = 2092768
Max contiguous free mem = 2092768
Allocated memory in use = 4288
Free memory = 2092864
----- fragmented memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
96 1 96**
2092768 1 2092768*
* - top most releasable chunk.
** - contiguous memory on top of heap.
----- allocated memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
MEMPOOL_HEAPCACHE_0 POOL STATS:
Non-mmapped bytes allocated = 312475648
Number of free chunks = 676
Number of mmapped regions = 0
Mmapped bytes allocated = 0
Max memory footprint = 312475648
Keepcost = 2005376
Max contiguous free mem = 2005376
Allocated memory in use = 309212912
Free memory = 3262736
----- fragmented memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
32 257 8224
48 198 9504
64 178 11392
80 2 160
96 1 96**
96 1 96
112 1 112
144 3 432
160 1 160
192 1 192
208 1 208
224 1 224
240 1 240
256 8 2320
384 6 2496
512 5 2768
3072 1 3856
4096 2 10032
6144 4 28624
24576 1 29024
131072 1 179424
786432 1 965200
2005376 1 2005376*
* - top most releasable chunk.
** - contiguous memory on top of heap.
----- allocated memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
80 1143 91440
96 11894 1141824
112 3220 360640
128 1725 220800
144 3324 478656
160 450 72000
176 397 69872
192 383 73536
208 275 57200
224 275 61600
240 210 50400
256 3153 807168
384 664 254976
512 1275 652800
768 698 536064
1024 788 806912
1536 209 321024
2048 264 540672
3072 163 500736
4096 787 3223552
6144 59 362496
8192 210 1720320
12288 131 1609728
16384 595 9748480
24576 29 712704
32768 94 3080192
49152 26 1277952
65536 206 13500416
98304 22 2162688
131072 19 2490368
196608 19 3735552
262144 21 5505024
393216 20 7864320
524288 13 6815744
786432 3 2359296
1048576 21 22020096
1572864 13 20447232
2097152 5 10485760
3145728 2 6291456
4194304 4 16777216
8388608 3 25165824
12582912 3 37748736
MEMPOOL_DMA POOL STATS:
Non-mmapped bytes allocated = 499122176
Number of free chunks = 176
Number of mmapped regions = 0
Mmapped bytes allocated = 0
Max memory footprint = 499122176
Keepcost = 262755296
Max contiguous free mem = 262755296
Allocated memory in use = 236276720
Free memory = 262845456
----- fragmented memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
48 31 1488
80 17 1360
96 1 96**
96 4 384
112 2 224
128 4 512
144 13 1872
160 1 160
176 24 4224
192 3 576
208 1 208
224 26 5824
240 1 240
512 1 688
768 2 1792
1024 42 44448
4096 1 4864
16384 1 21040
262755296 1 262755296*
* - top most releasable chunk.
** - contiguous memory on top of heap.
----- allocated memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
160 2 320
224 2 448
240 313 75120
256 7 1792
384 2 768
512 2 1024
768 3 2304
1024 167 171008
1536 1023 1571328
2048 2 4096
4096 4 16384
12288 2 24576
16384 18 294912
24576 2 49152
32768 6 196608
65536 9 589824
131072 13 1703936
196608 5 983040
262144 4 1048576
393216 5 1966080
524288 2 1048576
786432 5 3932160
1048576 3 3145728
1572864 2 3145728
2097152 8 16777216
3145728 3 9437184
4194304 4 16777216
12582912 3 37748736
MEMPOOL_GLOBAL_SHARED POOL STATS:
Non-mmapped bytes allocated = 135168
Number of free chunks = 3
Number of mmapped regions = 0
Mmapped bytes allocated = 0
Max memory footprint = 0
Keepcost = 103664
Max contiguous free mem = 0
Allocated memory in use = 752
Free memory = 134416
----- fragmented memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
----- allocated memory statistics -----
fragment size count total
(bytes) (bytes)
---------------- ---------- --------------
168 1 168
184 3 552
Summary for all pools:
Non-mmapped bytes allocated = 813830144
Number of free chunks = 856
Number of mmapped regions = 0
Mmapped bytes allocated = 0
Max memory footprint = 813694976
Keepcost = 266957104
Allocated memory in use = 545494672
Free memory = 268335472Thanks
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01-29-2021 04:52 AM
Have a look to see if you are hitting this bug:
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCux86596/?rfs=iqvred
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02-03-2021 02:11 AM
Hi Marius,
Thanks for the link.
From what i can see this has been fixed in 9.7.1 and 9.6.2 but we are running much newer firmware version - 9.8(4)25
Thanks
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02-03-2021 11:35 AM
I would normally agree that 9.7.1 and later should have the bug fix included, though I have come across som bugs that were fixed in one version but showed up again in a later version (this was on 3650 switches and related to memory leaks)
Have you tried and/or are you able to perform a reboot of the ASA? often a reboot will solve these types of issues.
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02-03-2021 12:07 PM
I remember having similar problem on Cisco ASA5512-X, reboot can fix it but it will show up again.
I think trying to change some settings might reduce the usage of your Firewall resources
* disable logs for rules that you don't need to log all time
* change tcp session timers
HTH
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02-03-2021 12:25 PM
I am still leaning towards that this is a bug, even though the ASA is running a newer version.
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