[c-nsp] WCCPv2 Cisco 7600 + mask assignment problems

[Steven Wilton]

> -----Original Message-----
> From: Lincoln Dale (ltd) [mailto:ltd at cisco.com] 
> Sent: Monday, 11 September 2006 10:17 AM
> To: Steven Wilton; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] WCCPv2 Cisco 7600 + mask assignment problems
> 
> g'day Steven,
> 
> I'll preface this by saying its cool to see that someone is finally
> writing proper hash-mask support for squid.  BUT, I'll preface all of
> this by saying that _IF_ you NEED hash-mask (because of alternate
> methods on cat6k/7600 cause too much traffic out of h/w-switched paths
> on the switch/router), then its very very very unlikely that 
> Squid will
> cut it for you.
> put simply, unless something significant has changed in the 
> last couple
> of years, squid just ain't made for high performance.
 

I've just comitted a working mask assignment implementation to the squid 2.6 branch.  This was mainly made possible with help from Adrian in getting some wccp packet dumps from a Cisco cache engine.   Any squid release from squid-2.6.STABLE3-20060921 onwards should contain this code.

We did run into a slight problem because we were running WCCP services on traffic going out an interface (ie "ip wccp <service> redirect out").  The 7600 can only push the WCCP traffic through the fast switching path for wccp services that are defined for traffic coming "in" an interface.

Squid has had a couple of major improvements recently that allow it to scale much better than it could before (epoll and COSS are a couple that have made a big difference for us).


cheers

Steven

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