Re: [squid-users] Massive Squid Deployment

Chris Woodfield wrote:
> One performance-specific 2.7 question - I recall hearing mention of an
> issue with 2.6 where larger objects held in mem_cache required
> exponentially more CPU cycles to serve up (i.e. n cycles for a 4KB
> object, n*2 for an 8KB object, n*4 for a 12KB object, etc). Does anyone
> know if this issue is still present in 2.7 code?
>

Henrik knows more, but I believe its the same in all Squid-2 code. IIRC
it was an architecture change that fixed it in 3.0.

Amos

> Thanks,
>
> -C
>
> On Apr 1, 2009, at 12:42 AM, Amos Jeffries wrote:
>
>>>
>>> Hello people, I'm having some bottlenecks on our squid deployement and I
>>> was
>>> wondering if anyone had any recommendations because I'm near out of
>>> ideas.
>>> Would someone change my architecture or does anyone have any experience
>>> with
>>> a squid deployment of this size? Basically we are pushing 600mb at
>>> 240,000k
>>> connections. When we reach speeds on our around that that number, we
>>> start
>>> seeing slow performance and getting alot of page timeouts. We are
>>> running
>>> 20
>>> squid 2.6 boxes running dsr behind a single foundry gte load balancer. I
>>> recently had 18 squid boxes and thought we had a squid bottleneck but no
>>> change. I was kinda leaning in the direction of splitting it in half and
>>> doing multiple load balancers. Does anyone have any experience pushing
>>> this
>>> much traffic?
>>
>> I'd go to 2.7 if it was squid being slow. It has a number of small
>> performance boosters missing in 2.6.
>>
>> But, it does sound like a load balancer bottleneck if you had zero change
>> from adding two more Squid. The Yahoo and Wikimedia guys are the poster
>> installs for these types of Squid deployment and they use CARP meshing.
>>
>> PS: We are very interested in getting some real-world benchmarks from
>> high-load systems like yours. Can you grab the data needed for
>> http://wiki.squid-cache.org/KnowledgeBase/Benchmarks ?
>>
>> Amos
>>
>>
>>
>

-- 
Please be using
   Current Stable Squid 2.7.STABLE6 or 3.0.STABLE13
   Current Beta Squid 3.1.0.6