[SR-Users] : hight shared memory usage

[Henning Westerholt]

Am Mittwoch, 24. Oktober 2018, 15:24:05 CEST schrieb Laurent Schweizer:
> I have 2 proxy running  and we have a very big difference of memory usage
> between them, moreover we have more connected users on the proxy with less
> memory usage.
> 
> We have this issue on the first proxy, today we have to increase the shared
> memory  as it was no more possible to setup new TCP connection.
> 
> We use the same version of the proxy, script is quite the same, one
> difference, on the proxy with the issue we increase the number of max TLS
> connection to 20K
> 
> Any idea ?
> is TLS consuming more memory than TCP or UDP ?

Hello Laurent,

TLS is using more memory than TCP and than UDP, due to the higher workload and 
overhead for crypto/connection tracking.

But looking to your registered user count this should not make a big 
difference in the end.

Do you have maybe a different usage pattern on the first proxy comparing to 
the second one? So that different parts of the cfg or the code are executed?

Why do you increased the number of max TLS connections on the first proxy, you 
had also some issues here?

> First proxy (with high memory usage):
> 
> 
> [cycle #: 3; if constant make sure server lives]
> Kamailio Runtime Details:
> kamailio 5.0.6 (x86_64/linux)
>     now:  Wed Oct 24 15:18:55 2018
>     up_since: Wed Oct 24 13:21:12 2018
>     uptime: 7063
> 
> Transaction Statistics:
>     tmx:UAS_transactions = 56240            tmx:active_transactions = 4
>     tmx:UAC_transactions = 0                tmx:inuse_transactions = 18
> 
> Stateless Server Statistics:
>     sl:sent_replies = 134317        sl:sent_err_replies = 0
> 
> UsrLoc Statistics:
>     usrloc:location_ch-contacts = 1463      usrloc:location_ch-users = 1181
>     usrloc:location_ch-expires = 1076       usrloc:registered_users = 1181
> 
> Core Statistics:
>     core:rcv_requests = 214220      core:rcv_replies = 179145
>     core:fwd_requests = 5495        core:fwd_replies = 73
> 
> Shared Memory Statistics:
>     shmem:fragments = 529                   shmem:real_used_size =
> 15862690496 shmem:free_size = 36566109504           shmem:total_size =
> 52428800000 shmem:max_used_size = 16198927224       shmem:used_size =
> 15854961104
> 
> 
> 
> cat /proc/net/netstat | cut -d" " -f12-17 ; cat /proc/net/sockstat
> TW TWRecycled TWKilled PAWSPassive PAWSActive PAWSEstab
> 339118 0 684 3195 0 4648
> InBcastOctets OutBcastOctets InCsumErrors InNoECTPkts InECT1Pkts InECT0Pkts
> 14620680 0 0 19142166496 9683 133135
> sockets: used 1951
> TCP: inuse 1029 orphan 0 tw 2 alloc 1036 mem 15
> UDP: inuse 540 mem 446
> UDPLITE: inuse 0
> RAW: inuse 0
> FRAG: inuse 0 memory 0
> 
> 
> 
> -------------------------------------------
> 
> 
> Second proxy (memory is OK) :
> 
> [cycle #: 2; if constant make sure server lives]
> Kamailio Runtime Details:
> kamailio 5.0.6 (x86_64/linux)
>     now:  Wed Oct 24 15:19:39 2018
>     up_since: Mon Jul  2 00:31:48 2018
>     uptime: 9902871
> 
> Transaction Statistics:
>     tmx:UAS_transactions = 86712048         tmx:active_transactions = 92
>     tmx:UAC_transactions = 0                tmx:inuse_transactions = 178
> 
> Stateless Server Statistics:
>     sl:sent_replies = 641635175     sl:sent_err_replies = 0
> 
> UsrLoc Statistics:
>     usrloc:location-contacts = 3971         usrloc:location-users = 3845
>     usrloc:location-expires = 286685        usrloc:registered_users = 3845
> 
> Core Statistics:
>     core:rcv_requests = 752644955           core:rcv_replies = 1181197213
>     core:fwd_requests = 14482059            core:fwd_replies = 206909
> 
> Shared Memory Statistics:
>     shmem:fragments = 28437                 shmem:real_used_size = 56447456
>     shmem:free_size = 2091036192            shmem:total_size = 2147483648
>     shmem:max_used_size = 82099768          shmem:used_size = 43354160
> 
> 
> cat /proc/net/netstat | cut -d" " -f12-17 ; cat /proc/net/sockstat
> TW TWRecycled TWKilled PAWSPassive PAWSActive PAWSEstab
> 273625 0 0 0 0 3524
> InBcastOctets OutBcastOctets InCsumErrors InNoECTPkts InECT1Pkts InECT0Pkts
> 2010 0 1 179031265416 81564 21432766
> sockets: used 4964
> TCP: inuse 576 orphan 0 tw 3 alloc 681 mem 105
> UDP: inuse 3908 mem 3117
> UDPLITE: inuse 0
> RAW: inuse 0
> FRAG: inuse 0 memory 0

Best regards,

Henning

-- 
Henning Westerholt - https://skalatan.de/blog/
Kamailio security assessment - https://skalatan.de/de/assessment