On 01/14/2018 10:53 PM, Ivan Larionov wrote: > After migrating squid from non-SMP/aufs to SMP/rock memory cache hit > ratio dropped significantly. Like from 50-100% to 1-5%. This could be a side effect of not supporting Vary caching in shared memory: https://bugs.squid-cache.org/show_bug.cgi?id=3806#c9 > And disk cache hit ratio went up from 15-50% to stable 60-65%. I hope your total/combined hit ratio improved overall. > it looks like in SMP/rock mode squid avoids using memory for small > files like 1-3KB but uses it for 10KB+ files. No, there is no such size-discrimination code in Squid. > I started tracking down the issue with disabling disk cache completely > and it didn't change anything, I just started to get MISS every time for > the URL which was getting MEM_HIT with an old configuration. Then I > changed "workers 2" to "workers 1" and started getting memory hits as > before. For a clean apples-to-apples test, make sure you use "memory_cache_shared on" when using a single worker without rock cache_dirs. > Am I doing anything wrong? Which debug options should I enable to > provide more information if it seems like a bug? Vary caching should be fixed as well, of course, but perhaps there is another problem we do not know about. I would start by eliminating Vary as the known problem. When using a test transaction, make sure the response does not have a Vary header. Or configure Squid to log the Vary header and remove the corresponding transactions when computing adjusted-for-Vary memory cache hit ratio. HTH, Alex. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
