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Hi,

I have Squid 5.6 on a FreeBSD 13.1 server with 16GB RAM

I noticed that squid starts to consume a lot of ram until it starts to
consume swap space. When this happens, browsing becomes extremely
slow.

This is happening at least once a week when I have to restart squid to
get it back to normal.

Any ideas?

############# Wed Jan 25 08:30:00 -03 2023 #############

HTTP/1.1 200 OK
Server: squid
Mime-Version: 1.0
Date: Wed, 25 Jan 2023 11:30:00 GMT
Content-Type: text/plain;charset=utf-8
Expires: Wed, 25 Jan 2023 11:30:00 GMT
Last-Modified: Wed, 25 Jan 2023 11:30:00 GMT
X-Cache: MISS from xxxx.xxxx.xxxx
X-Cache-Lookup: MISS from xxxx.xxxx.xxxx:3128
Via: 1.1 xxxx.xxxx.xxxx (squid)
Connection: close

Squid Object Cache: Version 5.6
Build Info:
Service Name: squid
Start Time: Thu, 19 Jan 2023 20:25:17 GMT
Current Time: Wed, 25 Jan 2023 11:30:00 GMT
Connection information for squid:
     Number of clients accessing cache: 224
     Number of HTTP requests received: 7541590
     Number of ICP messages received: 0
     Number of ICP messages sent: 0
     Number of queued ICP replies: 0
     Number of HTCP messages received: 0
     Number of HTCP messages sent: 0
     Request failure ratio: 0.00
     Average HTTP requests per minute since start: 930.5
     Average ICP messages per minute since start: 0.0
     Select loop called: 78733524 times, 6.176 ms avg
Cache information for squid:
     Hits as % of all requests: 5min: 8.4%, 60min: 12.1%
     Hits as % of bytes sent: 5min: 21.6%, 60min: 14.1%
     Memory hits as % of hit requests: 5min: 90.8%, 60min: 75.9%
     Disk hits as % of hit requests: 5min: 4.0%, 60min: 19.7%
     Storage Swap size: 2829956 KB
     Storage Swap capacity: 90.0% used, 10.0% free
     Storage Mem size: 16172 KB
     Storage Mem capacity: 98.7% used,  1.3% free
     Mean Object Size: 28.95 KB
     Requests given to unlinkd: 186982
Median Service Times (seconds)  5 min    60 min:
HTTP Requests (All):   0.00562  0.01847
     Cache Misses:          0.15048  0.23230
     Cache Hits:            0.00000  0.00000
     Near Hits:             0.14252  0.13498
     Not-Modified Replies:  0.00865  0.03066
     DNS Lookups:           0.00000  0.00372
     ICP Queries:           0.00000  0.00000
Resource usage for squid:
     UP Time: 486282.612 seconds
     CPU Time: 65555.712 seconds
     CPU Usage: 13.48%
     CPU Usage, 5 minute avg: 26.89%
     CPU Usage, 60 minute avg: 68.00%
     Maximum Resident Size: 37896960 KB
     Page faults with physical i/o: 10843
Memory accounted for:
     Total accounted:       -1459461 KB
     memPoolAlloc calls:     11408
     memPoolFree calls:  1888969689
File descriptor usage for squid:
     Maximum number of file descriptors:   4096
     Largest file desc currently in use:   2149
     Number of file desc currently in use:  679
     Files queued for open:                   0
     Available number of file descriptors: 3417
     Reserved number of file descriptors:   100
     Store Disk files open:                   0
Internal Data Structures:
     97906 StoreEntries
     3002 StoreEntries with MemObjects
     2838 Hot Object Cache Items
     97742 on-disk objects

------ pfctl -si ------

Status: Enabled for 25 days 22:58:24          Debug: Urgent

State Table                          Total             Rate
  current entries                     8085
  searches                      6650475717         2965.4/s
  inserts                        133521957           59.5/s
  removals                       133552376           59.5/s
Counters
  match                          605960865          270.2/s
  bad-offset                             0            0.0/s
  fragment                               1            0.0/s
  short                                 54            0.0/s
  normalize                            659            0.0/s
  memory                                 0            0.0/s
  bad-timestamp                          0            0.0/s
  congestion                             0            0.0/s
  ip-option                              0            0.0/s
  proto-cksum                            0            0.0/s
  state-mismatch                    104674            0.0/s
  state-insert                       38501            0.0/s
  state-limit                            0            0.0/s
  src-limit                              0            0.0/s
  synproxy                               0            0.0/s
  map-failed                             0            0.0/s

------ sysctl -a | grep swap  ------

swap_pager: out of swap space
swp_pager_getswapspace(32): failed
swap_pager: out of swap space
swp_pager_getswapspace(31): failed
swap_pager: out of swap space
swp_pager_getswapspace(1): failed
1 PART da0p2 2147483648 512 i 2 o 544768 ty freebsd-swap xs GPT xt
516e7cb5-6ecf-11d6-8ff8-00022d09712b
0 MD md1 94371840 512 u 1 s 512 f 0 fs 0 l 94371840 t swap label
0 MD md0 62914560 512 u 0 s 512 f 0 fs 0 l 62914560 t swap label
z0xfffff80003ec5800 [shape=box,label="SWAP\nswap\nr#3"];
      <name>swap</name>
    <type>swap</type>
    <type>swap</type>
    <type>freebsd-swap</type>
vm.swap_enabled: 1
vm.domain.0.stats.unswappable: 2044
vm.swap_idle_threshold2: 10
vm.swap_idle_threshold1: 2
vm.swap_idle_enabled: 0
vm.disable_swapspace_pageouts: 0
vm.stats.vm.v_swappgsout: 3154299
vm.stats.vm.v_swappgsin: 510404
vm.stats.vm.v_swapout: 174446
vm.stats.vm.v_swapin: 62590
vm.stats.swap.free_completed: 54375
vm.stats.swap.free_deferred: 56992
vm.nswapdev: 1
vm.swap_fragmentation:
vm.swap_async_max: 4
vm.swap_maxpages: 32572800
vm.swap_total: 2147483648
vm.swap_reserved: 384676114432

------ /usr/sbin/swapinfo -h  ------

Device              Size     Used    Avail Capacity
/dev/da0p2          2.0G     2.0G     8.0K   100%


############# squid.conf #############

http_port 3128 ssl-bump generate-host-certificates=on
dynamic_cert_mem_cache_size=20MB cert=/xxxx/conf/certs/ca.crt
key=/xxxx/conf/certs/ca.key
http_port 3129 intercept
https_port 3130 intercept ssl-bump generate-host-certificates=on
dynamic_cert_mem_cache_size=20MB cert=/xxxx/conf/certs/ca.crt
key=/xxxx/conf/certs/ca.key
visible_hostname xxxx.xxxx.xxxx
max_filedescriptors 4096
maximum_object_size 4096 KB
minimum_object_size 0 KB
maximum_object_size_in_memory 256 KB
fqdncache_size 1024
cache_mgr xxxx@xxxx
dns_nameservers 127.0.0.1
cache_replacement_policy                heap LFUDA
memory_replacement_policy               heap GDSF
cache_mem 16 MB
cache_dir               ufs /xxxx/chroot/osproxy/cache 3072 32 256
forwarded_for on
memory_pools off
logformat xxxx %ts|%6tr|%>a|%Ss|%03>Hs|%<st|%rm|%un|%mt|%ea|%ru
logfile_rotate 0
httpd_suppress_version_string on
strip_query_terms off
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