Re: [squid-users] Squid transparent mode slow down clients

Tek Bahadur Limbu ha scritto:

> Hi Ferraroni ,
>
> Ferraroni Matteo wrote:
>> Hi folks,
>> I have a little bandwidth problem. My customer's network is simple
>> like this: internet ---> squid 2.6 StabLe 5 (trasparent mode) ---->
>> lan 172.16.0.0/16
>>
>> Now, the problem is that when I redirect the 80 port to 8080 (squid)
>> all the clients' connection slow down (from 250 Kbyte/s to 20/30
>> kbyte/s), and when I disable the iptables rule all returns fast.
>
> How did you measure the slowdown is speed? And what is your actual
> bandwidth pipe?
>
Hi, the slowdown is mesured through the IE download window (no squid:
250 Kb, with squid 60 Kb), the bandwidth pipe is 2 Megabits.
>>
>> How can I solve this?
>>
>> Squid.conf
>>
>> http_port 8080 transparent
>> icp_port 0
>> htcp_port 0
>> cache_access_log /var/log/squid/access.log
>> cache_log /var/log/squid/cache.log
>> cache_store_log /var/log/squid/store.log
>> emulate_httpd_log on
>> mime_table /etc/squid/mime.conf
>> pid_filename /var/run/squid.pid
>> dns_nameservers 213.140.2.12 208.67.222.222 193.205.245.66
>> acl all src 0.0.0.0/0.0.0.0
>> http_access allow all
>>
>> iptables rules
>>
>> $IPTABLES -t nat -A PREROUTING -p tcp --dport 80 -s 172.16.0.0/16 -j
>> REDIRECT --to-port 8080
>> $IPTABLES -t nat -A POSTROUTING -s 172.16.0.0/16 -j SNAT --to-source
>> 192.168.1.2
>
> How many network interfaces does your Squid box have? So this box
> performs NAT and Proxy service simultaneously?
>
The squid box has 2 netwoks attached (192.168.1.0/24 on the internet
side and 172.16.0.0/16 on the lan side) the box performs NAT and Proxy
services simultaneously.
> Maybe you have large ACLs filtering on your squid.conf? What is the
> output of "squidclient mgr:info"?
The squid.conf is above and I have only one acl.
Here you are the squidclient mgr:info output.

Squid Object Cache: Version 2.6.STABLE17
Start Time: Wed, 12 Dec 2007 13:10:26 GMT
Current Time: Wed, 12 Dec 2007 13:10:39 GMT
Connection information for squid:
       Number of clients accessing cache: 2
       Number of HTTP requests received: 4
       Number of ICP messages received: 0
       Number of ICP messages sent: 0
       Number of queued ICP replies: 0
       Number of HTCP messages received: 0
       Number of HTCP messages sent: 0
       Request failure ratio: 0.00
       Average HTTP requests per minute since start: 18.9
       Average ICP messages per minute since start: 0.0
       Select loop called: 86 times, 147.512 ms avg
Cache information for squid:
       Request Hit Ratios: 5min: 0.0%, 60min: 0.0%
       Byte Hit Ratios: 5min: -0.0%, 60min: -0.0%
       Request Memory Hit Ratios: 5min: 0.0%, 60min: 0.0%
       Request Disk Hit Ratios: 5min: 0.0%, 60min: 0.0%
       Storage Swap size: 0 KB
       Storage Mem size: 108 KB
       Mean Object Size: 0.00 KB
       Requests given to unlinkd: 0
Median Service Times (seconds) 5 min 60 min:
       HTTP Requests (All): 0.00000 0.00000
       Cache Misses: 0.00000 0.00000
       Cache Hits: 0.00000 0.00000
       Near Hits: 0.00000 0.00000
       Not-Modified Replies: 0.00000 0.00000
       DNS Lookups: 0.00000 0.00000
       ICP Queries: 0.00000 0.00000
Resource usage for squid:
       UP Time: 12.686 seconds
       CPU Time: 0.008 seconds
       CPU Usage: 0.06%
       CPU Usage, 5 minute avg: 0.00%
       CPU Usage, 60 minute avg: 0.00%
       Process Data Segment Size via sbrk(): 2292 KB
       Maximum Resident Size: 0 KB
       Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
       Total space in arena: 2292 KB
       Ordinary blocks: 2050 KB 3 blks
       Small blocks: 0 KB 0 blks
       Holding blocks: 240 KB 1 blks
       Free Small blocks: 0 KB
       Free Ordinary blocks: 241 KB
       Total in use: 2290 KB 90%
       Total free: 241 KB 10%
       Total size: 2532 KB
Memory accounted for:
       Total accounted: 157 KB
       memPoolAlloc calls: 1033
       memPoolFree calls: 376
File descriptor usage for squid:
       Maximum number of file descriptors: 1024
       Largest file desc currently in use: 13
       Number of file desc currently in use: 10
       Files queued for open: 0
       Available number of file descriptors: 1014
       Reserved number of file descriptors: 100
       Store Disk files open: 0
       IO loop method: epoll
Internal Data Structures:
           27 StoreEntries
           27 StoreEntries with MemObjects
           26 Hot Object Cache Items
            0 on-disk objects

UPDATE: After the squid upgrade, my client downloads the first 4 megs at
full speed and afterwards it slows down to 60Kbytes/s. The same
behaviour is seen with different URLS.

Thanks in advance.
Matteo
Received on Wed Dec 12 2007 - 06:59:12 MST