Re: [squid-users] performance issues Please help

It looks to me as if your ratio of page faults vs http requests is much
too high; the reason is that you allocate too much memory (cache_mem
parameter) to squid;

I advise you to decrease the amount or Ram to be used by the squid
process, from 256 Mb to 64 Mb; and you could also lower your HD cache
space (cache_dir parameter), as each Gb on disk uses at least 10 Mb Ram.
And with only 1 Gb Ram, this forces your machine to start swapping.

Regards

Laurent Evrard

DWysocki@elginisd.net wrote:

>I was wondering if someone could help me with some performance issues?
>
>Our performance is not what I think it should be.
>And after awhile it slows down.
>
>I am running Redhat 8
>Intell P3 server with 1gig Ram
>I am running Squid Version 2.5.Stable5
>
>with options ./configure --enable-storio=diskd,ufs --enable-gnurex
>
>We have on average between 250 and 500 connections to the internet at one
>time durring school hours.
>
>We have one full (not a fractional) T1 line to our ISP.
>
>We are using a 2500 Watchguard Firewall and the squid box is sitting on a
>(DMZ or optional side of the firewall)
>
>The clients hit the firewall and the firewall sends the http traffic to the
>squid box.
>
>
>Some conf details
>
>cache_mem 250 MB
># cache_swap_low 90
># cache_swap_high 95
>maximum_object_size 14096 KB
># maximum_object_size_in_memory 8 KB
># ipcache_size 1024
># ipcache_low 90
># ipcache_high 95
>cache_replacement_policy lru
>memory_replacement_policy lru
>cache_dir ufs /data/squid/var/cache 80000 16 256
># log_ip_on_direct on
>
>
>lines with # are default.
>
>
>Store Directory Statistics:
>Store Entries : 3689485
>Maximum Swap Size : 81920000 KB
>Current Store Swap Size: 46268484 KB
>Current Capacity : 56% used, 44% free
>Store Directory #0 (ufs): /data/squid/var/cache
>FS Block Size 4096 Bytes
>First level subdirectories: 16
>Second level subdirectories: 256
>Maximum Size: 81920000 KB
>Current Size: 46268484 KB
>Percent Used: 56.48%
>Filemap bits in use: 3687088 of 4194304 (88%)
>Filesystem Space in use: 46985560/117922124 KB (40%)
>Filesystem Inodes in use: 3689846/14991360 (25%)
>Flags: SELECTED Removal policy: lru
>LRU reference age: 195.80 days
>
>
>
>Squid Object Cache: Version 2.5.STABLE5-20040420
>Start Time: Tue, 20 Apr 2004 23:22:44 GMT
>Current Time: Thu, 22 Apr 2004 15:26:03 GMT
>Connection information for squid:
> Number of clients accessing cache: 3
> Number of HTTP requests received: 788280
> Number of ICP messages received: 0
> Number of ICP messages sent: 0
> Number of queued ICP replies: 0
> Request failure ratio: 0.00
> Average HTTP requests per minute since start: 328.0
> Average ICP messages per minute since start: 0.0
> Select loop called: 23164260 times, 6.225 ms avg
>Cache information for squid:
> Request Hit Ratios: 5min: 46.7%, 60min: 50.3%
> Byte Hit Ratios: 5min: 19.0%, 60min: 22.4%
> Request Memory Hit Ratios: 5min: 0.4%, 60min: 0.8%
> Request Disk Hit Ratios: 5min: 32.1%, 60min: 34.7%
> Storage Swap size: 46185448 KB
> Storage Mem size: 255952 KB
> Mean Object Size: 12.54 KB
> Requests given to unlinkd: 21702
>Median Service Times (seconds) 5 min 60 min:
> HTTP Requests (All): 0.12106 0.10281
> Cache Misses: 0.30459 0.28853
> Cache Hits: 0.00919 0.00678
> Near Hits: 0.19742 0.18699
> Not-Modified Replies: 0.00179 0.00179
> DNS Lookups: 0.00278 0.00278
> ICP Queries: 0.00000 0.00000
>Resource usage for squid:
> UP Time: 144198.544 seconds
> CPU Time: 3084.180 seconds
> CPU Usage: 2.14%
> CPU Usage, 5 minute avg: 5.98%
> CPU Usage, 60 minute avg: 6.03%
> Process Data Segment Size via sbrk(): 664610 KB
> Maximum Resident Size: 0 KB
> Page faults with physical i/o: 200238
>Memory usage for squid via mallinfo():
> Total space in arena: 664610 KB
> Ordinary blocks: 664601 KB 41 blks
> Small blocks: 0 KB 0 blks
> Holding blocks: 2760 KB 3 blks
> Free Small blocks: 0 KB
> Free Ordinary blocks: 8 KB
> Total in use: 667361 KB 100%
> Total free: 8 KB 0%
> Total size: 667370 KB
>Memory accounted for:
> Total accounted: 573691 KB
> memPoolAlloc calls: 113950836
> memPoolFree calls: 101771008
>File descriptor usage for squid:
> Maximum number of file descriptors: 1024
> Largest file desc currently in use: 229
> Number of file desc currently in use: 223
> Files queued for open: 0
> Available number of file descriptors: 801
> Reserved number of file descriptors: 100
> Store Disk files open: 15
>Internal Data Structures:
> 3685496 StoreEntries
> 54433 StoreEntries with MemObjects
> 54370 Hot Object Cache Items
> 3683103 on-disk objects
>
>
>
>
>
Received on Thu Apr 22 2004 - 11:01:42 MDT