[squid-users] Maximum Bandwidth a squid server can Handle

[Siva Prakash]

Thanks a lot, Eliezer and Amos.

Your Views are going to help me lot :)


On Fri, Dec 12, 2014 at 3:44 PM, Amos Jeffries <squid3 at treenet.co.nz> wrote:

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> On 12/12/2014 4:41 a.m., Siva Prakash wrote:
> > Thanks for your valuable input, Eliezer and Amos.
> >
> > I have added the rough hardware and squid configuration, please
> > guide me out with how much request squid can handle per second,
> >
> > CPU Speed - each 3.30GHz( totally 5 processors)
> >
> > RAM - 4 GB
> >
> > NIC - one 10 GB Ethernet Adapter
> >
> > Squid Version - 3.4
> >
> > Squid configuration - For authentication, it is integrated with AD
> > and lots of ACLs(1000) to block sites.
> >
>
> On a 3.3GHz CPU core I would expect an upper limit of around 3000 RPS.
>
> The bottlneck will be the AD processing delays. Most of HTTP
> performance features and mechanisms have to be disabled in order to
> get NTLM or Kerberos authentication to work. That reduces Squid
> performance by roughly a factor of 3-4. You would be lucky to get 1000
> RPS per core out of the auth systems, though not all requests need the
> full auth latency so call it 1500 RPS max.
>
> With 4 CPU for Squid and one for OS, thats 6-12K RPS for the machine.
> If we assume your traffic has average object size ~40KB that measures
> up at around 250 Mbps combined for 4 Squid worker processes.
>
>
> These are very, very rough guesstimate *upper* limit numbers. The only
> way to be at all sure is to actually run the traffic through the proxy
> and find out. Squid has a lot of tuning knobs that can affect the
> performance.
>
> Amos
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