Jevos, Peter wrote:
Hi all
I'd like to ask you how can I improve my Hit Ratio ( byte or request )
cause it's on average 12-15 %, so it seems too low
I'm using cacti to measure squid snmp activites and my basic config is:
RAM: 1 GB
cache_mem 8 MB
maximum_object_size_in_memory 1 MB
cache_dir ufs /var/cache/squid 5500 16 256
minimum_object_size 0 bytes
maximum_object_size 4194304 bytes
cache_swap_low 90
cache_swap_high 95
refresh_pattern windowsupdate.com/.*\.(cab|exe) 4320 100% 43200
reload-into-ims
refresh_pattern download.microsoft.com/.*\.(cab|exe) 4320 100% 43200
reload-into-ims
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i \.(gif|png|jpg|jpeg|ico)$ 10080 90% 43200
override-expire ignore-no-cache ignore-private
refresh_pattern -i \.(iso|avi|wav|mp3|mp4|mpeg|swf|flv|x-flv)$ 43200 90%
432000 override-expire ignore-no-cache ignore-private
refresh_pattern -i \.(deb|rpm|exe|zip|tar|tgz|ram|rar|bin|ppt|doc|tiff)$
10080 90% 43200 override-expire ignore-no-cache ignore-p
rivate
refresh_pattern -i \.index.(html|htm)$ 0 40% 10080
refresh_pattern -i \.(html|htm|css|js)$ 1440 40% 40320
refresh_pattern . 0 40% 40320
I'm hosting about 30 clients.
FQDNcache Entries: 362
FQDNcache Requests: 25181
FQDNcache Hits: 15192
FQDNcache Negative Hits: 5348
FQDNcache Misses: 4641
IP Cache Statistics:
IPcache Entries: 920
IPcache Requests: 497622
IPcache Hits: 332614
IPcache Negative Hits: 1088
IPcache Numeric Hits: 23602
IPcache Misses: 140318
Is it possible ot reach higher hit ratio ?
Without knowing your client's surfing habits, this is a hard question to
answer. I notice you have a refresh_pattern typical of Squid 2.5, which
means you probably also have lines like...
acl QUERY cgi-bin \?
cache deny QUERY
...which will deny caching anything that appears dynamic, even if the
headers indicate it's cacheable. Removing those, and adding...
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
...as your second-to-last refresh pattern might help. Using a log
analyzer like scalar.awk (http://scalar.risk.az/scalar095/) can go a
long way to showing what kind of objects are passing through your
cache. cachemgr's storedir output can give some useful information,
especially when using the default LRU replacement policy. Maybe you
need a larger cache. Perhaps your maximum_object_size is too small (or
too large). Or maybe your clients are just streaming music.
Thanks
pet
Chris
