Re: Squid slowing conections

You didn't mention your OS.

If you are running Linux, make sure it's the latest kernel version. Also,
make sure you are using DMA on that IDE HDD, the performance difference is
night and day. (Use hdparam to see the dma status)

I don't see why the delay pools are needed, try without them.

--
The comments and opinions expressed herein are those of the author of this 
message and may not reflect the policies of the Martin County Board of
County Commissioners.
On Wed, 23 Feb 2000, George Amaro wrote:
> Hi all,
> 
> We are using squid at our ISP for a long time, without
> any problems.
> 
> Recently, the squid starts to slow the internet conections:
> 
> 	- high delay to get information from the URLs
> 	- it seems it is caching thinks before send it
> 	  to the client
> 	
> We put squid off and, even without cache, we get best results
> for clients with dial-up conections.
> 
> Here some aspects of configuration:
> 
> - we are using transparent caching and the ASs are pointing to
>   squid as the default router;
> 
> - the machine is a Pentium II 333 with 128 MB RAM and
>   8GB EIDE just for squid;
> 
> - we have a maximum of 100 modem working at same time;
> 
> - squid conf:
> 
> 	cache_mem  64 MB
> 	maximum_object_size 5120 KB
> 	ipcache_size 1024
> 	cache_dir /var/spool/squid 8000 32 256
> 	dns_children 15
> 	refresh_pattern -i \.gif$  14400 80% 43200
> 	refresh_pattern -i \.tif?f$  14400 80% 43200
> 	refresh_pattern -i \.bmp$  14400 80% 43200
> 	refresh_pattern -i \.jpg$ 14400 80% 43200
> 	refresh_pattern -i \.jpeg$ 14400 80% 43200
> 	refresh_pattern -i \.xbm$  14400 80% 43200
> 	refresh_pattern -i \.png$  14400 80% 43200
> 	refresh_pattern -i \.wrl$  14400 80% 43200
> 	refresh_pattern -i \.ico$  14400 80% 43200
> 	refresh_pattern -i \.sit$  14400 80% 43200
> 	refresh_pattern -i \.zip$  14400 80% 43200
> 	refresh_pattern -i \.hqx$  14400 80% 43200
> 	refresh_pattern -i \.exe$  14400 80% 43200
> 	refresh_pattern -i \.arj$  14400 80% 43200
> 	refresh_pattern -i \.lzh$  14400 80% 43200
> 	refresh_pattern -i \.lha$  14400 80% 43200
> 	(and a few others like these)
> 	refresh_pattern .       0 20% 4320
> 	reference_age 2 weeks
> 	quick_abort_min 16 KB
> 	quick_abort_max 16 KB
> 	quick_abort_pct 95
> 	httpd_accel_host virtual
> 	httpd_accel_port 80
> 	httpd_accel_with_proxy on
> 	delay_pools 2
> 	delay_class 1 1
> 	delay_class 2 2
> 	delay_access 1 allow src_lan (LAN IPs)
> 	delay_access 1 deny all
> 	delay_access 2 allow src_clientes (MODEMS IPs)
> 	delay_access 2 deny all
> 	delay_parameters 1 65536/65536
> 	delay_parameters 2 8192/16384 4096/4096
> 	delay_initial_bucket_level 50
> 	
> Now, some questions I need your experience and help:
> 
> - Is there any modifications for the parametes above to increase
>   squid performance with there configuration?
> 
> - If the MODEMS supports only 33,600 kbps, is the delay pools right
> configured?
> 
> - If this machine is the gateway, is the problem with squid or with
> IPFWADM
>   to resend the packats for the real router in the network?
> 
> 	IPFWADM configuration:
> 		ipfwadm -I -a a -P tcp -S any/0 -D 127.0.0.1 80
> 		ipfwadm -I -a a -P tcp -S any/0 -D squid_IP_addr 80
> 		ipfwadm -I -a a -P tcp -S any/0 -D any/0 80 -r 3128
> 
> - I could tell to squid not to cache some URL. What is the best way
> (faster for
>   squid) to to this?
> 
> - Waht parameters from cachemgr could I use to measure the eficiency of
>   squid and to determine if the machine is enough for running the
>   cache?
> 
> I hope you can tell me something about this and, if you need some
> more information, please let me know.
> 
> TIA,
> 
> ----------
> George Amaro
> Brazilian Agricultural Research Corporation
> Network Engineering Team
> 
>