Re: [squid-users] Slow internet navigation squid vs blue coat

Hi,

Just want to put my two pennies in. 'Slow' internet navigation through
squid is often observed in case of incorrect DNS server settings on
squid box. Often issues are:
- ipv6 DNS queries are performed first;
- first DNS server in /etc/resolv.conf is not responsible.

Both of these cases give plus 5-7 seconds to each request (dns request
time-out). So I'd recommend to make sure that DNS is not an issue here.

The easiest way to find out the place where delay is added is to sniff
request-response on squid box. Capture will show you what part of the
path adds delay.

Best wishes,
Pavel

On 11/25/2013 03:57 PM, Kinkie wrote:
> On Mon, Nov 25, 2013 at 11:26 AM, Michele Mase' <michele.mase_at_gmail.com> wrote:
>> Problem: internet navigation is extremely slow.
>> I've used squid from 1999 with no problems at all; during last month,
>> one proxy gave me a lot of troubles.
>> First we upgraded the system, from RHEL5.x - squid 2.6.x to RHEL6.x
>> squid3.4.x with no improvements.
>> Second, we have bypassed the Trend Micro Interscan proxy (the parent
>> proxy) without success.
>> Third: I do not know what to do.
>> So what should be done?
>> Some configuration improvements (sysctl/squid)?
>> Could it be a network related problem? (bandwidth/delay/MTU/other)?
> Hi Michele,
> "extremely slow" is quite a poor indication, unfortunately. Can you
> measure it? e.g. by using apachebench (ab) or squidclient to measure
> the time download a large file and a small file through the proxy from
> a local source and from a remote source. Then repeating the same from
> the box where Squid runs and then from a different box.
>
> Think about what has remained unchanged since when there was no
> performance problems: e.g. network cables, switches, routers etc.
>
> Kinkie
Received on Mon Nov 25 2013 - 13:56:38 MST