Hi,
I run squid in an ISP scenario. We have got two identically configured
squid caches being load balanced among 4,000 users over a 50 Mbps link. The
system runs quite well, although not without the occassional hiccups. But,
there is a complain from users about not being able to access some websites
because of same external IP. For this, we configured the squid.conf to have
ACLs for different user blocks of /24 and have them mapped through different
external IPs on each of these boxes.
However, not all /24 blocks have the same number of users, and I also have
lots of real IPs still lying unused. I thought about creating different
ACLs for every 5 or 8 users, and then map them to different external IPs.
But, having them distributed in 8 IPs in each group would mean at least 500
separate ACLs and their corresponding TCP_OUTGOING_ADDRESS directives.
My question is, will this affect the performance of squid? Can squid handle
this?
My servers are each running on Core 2 Duo 2.33 GHz, 8 GB of RAM, 5 HDDs
(1x80GB IDE for OS, 4x160GB SATA for cache), total 256GB Cache Store (64GB
on each HDD). One of the server's stats are (taken at a very low user count
time):
Squid Object Cache: Version 2.7.STABLE4
Connection information for squid:
Number of clients accessing cache: 2281
Number of HTTP requests received: 46553879
Number of ICP messages received: 10546598
Number of ICP messages sent: 10548558
Number of queued ICP replies: 0
Request failure ratio: 0.00
Average HTTP requests per minute since start: 7237.3
Average ICP messages per minute since start: 3279.5
Select loop called: 617194936 times, 0.625 ms avg
Cache information for squid:
Request Hit Ratios: 5min: 30.7%, 60min: 30.2%
Byte Hit Ratios: 5min: 7.1%, 60min: 5.4%
Request Memory Hit Ratios: 5min: 20.6%, 60min: 20.5%
Request Disk Hit Ratios: 5min: 32.3%, 60min: 32.7%
Storage Swap size: 241785428 KB
Storage Mem size: 4194120 KB
Mean Object Size: 35.02 KB
Requests given to unlinkd: 0
Median Service Times (seconds) 5 min 60 min:
HTTP Requests (All): 0.72387 0.33943
Cache Misses: 0.76407 0.55240
Cache Hits: 0.15048 0.03241
Near Hits: 0.89858 0.61549
Not-Modified Replies: 0.04277 0.00286
DNS Lookups: 0.04433 0.02447
ICP Queries: 0.03246 0.00037
Resource usage for squid:
UP Time: 385950.900 seconds
CPU Time: 51642.987 seconds
CPU Usage: 13.38%
CPU Usage, 5 minute avg: 35.09%
CPU Usage, 60 minute avg: 40.76%
Process Data Segment Size via sbrk(): 654836 KB
Maximum Resident Size: 0 KB
Page faults with physical i/o: 4
Memory usage for squid via mallinfo():
Total space in arena: -1798084 KB
Ordinary blocks: 2081758 KB 2399729 blks
Small blocks: 0 KB 0 blks
Holding blocks: 35360 KB 8 blks
Free Small blocks: 0 KB
Free Ordinary blocks: 314461 KB
Total in use: -2077186 KB 118%
Total free: 314461 KB -17%
Total size: -1762724 KB
Memory accounted for:
Total accounted: 5839838 KB
memPoolAlloc calls: 2143236778
memPoolFree calls: 2113174187
File descriptor usage for squid:
Maximum number of file descriptors: 65536
Largest file desc currently in use: 8734
Number of file desc currently in use: 1413
Files queued for open: 0
Available number of file descriptors: 64123
Reserved number of file descriptors: 100
Store Disk files open: 62
IO loop method: epoll
Internal Data Structures:
6913382 StoreEntries
324677 StoreEntries with MemObjects
324228 Hot Object Cache Items
6905066 on-disk objects
Can anybody advise?
Regards
NYAMUL HASSAN
