[squid-users] Squid-3.5.28 slowdown

[Michael Hendrie]

Hi Guys,

I have a squid-3.5.28 installation that is deployed to do transparent ssl-bump of HTTPS traffic (linux bridge, tproxy).  The server is not overly busy, CPU and RAM usage is low + no swap being used yet regularly the squid service is choking HTTPS traffic to a point where websites are timing out.  Any other traffic flowing through the bridge is unaffected and continues to operate at normal expected speeds.

I have checked all obvious things, CPU/RAM usage, network interface errors, conntrack table and TCP resource exhaustion yet all look fine. There is no caching taking place and disk IO is not a problem.

During the times where squid is slow, even using squidclient to query squid state is extremely slow to respond, as you can see below snip from the access.log the mgr:coutners and mgr:5min requests are taking up to 30 seconds to complete when usually the response time is 0:

1551397216.978     31 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397220.633      0 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397233.385      2 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397237.431     14 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397262.074      2 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397280.644     17 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397314.764      1 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397330.455      5 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397377.265      4 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397385.727      0 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397396.161     17 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/5min - HIER_NONE/- - -
1551397432.974     11 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397462.897     11 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397492.759      7 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397522.611      9 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397552.521     12 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397582.484     17 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -
1551397612.446     10 127.0.0.1 TCP_MISS/000 0 GET cache_object://localhost/counters - HIER_NONE/- - -

I have a number of these severs deployed, all running same hardware/config/squid versions and only this one is experiencing an issue.....looking for suggestions on what could be occurring and how to debug further?  

Thanks,

Michael
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.squid-cache.org/pipermail/squid-users/attachments/20190301/b493006e/attachment-0001.html>