Re: [squid-users] Re: is there any thing wrong from cache manager logs ?!!

On 11/11/2013 5:04 p.m., Dr.x wrote:
> Amos Jeffries-2 wrote
>> On 2013-11-08 12:29, Dr.x wrote:
>>> Amos Jeffries-2 wrote
>>>> On 2013-11-08 11:26, Dr.x wrote:
>>>>> .
>>>>>
>>>>>
>>>>>> Select loops:
>>>>>> * 1K/sec under the fast traffic period
>>>>>> * relaying 3.5MB/sec
>>>>>>
>>>>>> * 7K/sec and 9K/sec in the periods you indicate as slow
>>>>>> * relaying 4.7MB/sec
>>>>>>
>>>>>> => hints that Squid is looping once per packet or so.
>>>>>>
>>>>>>
>>>>>> Amos
>>>>>
>>>>> something not being understood ,
>>>>> if u look at graph
>>>>> u will note that "out" traffic is samller than "in" traffic !!!!
>>>>>
>>>>>
>>>>> not understanding why !!!!
>>>>>
>>>>
>>>> Think about what is "in" and "out" on that graph?
>>>> Keep in mind that for each request Squid is handling two TCP
>>>> connections, receiving and sending on both. Also performing HIT's on
>>>> ~4%
>>>> total HTTP traffic.
>>>>
>>>>
>>>> Amos
>>>
>>> hi amos , im not talkign about t the difference in , out ,
>>> im wondering why the "in" is higher than "out" ???
>>>
>>> shouldnt the "out" higher than "in" ( as a result of hit ration) ?????
>>>
>>
>> That depends on what they are measuring. Which is why I asked.
>>
>>
>>> i mean if i want to calculate wt im saving , i say (out-in)but in my
>>> case
>>> its in -ve !!!!
>>>
>>
>> IF you measure "in" as being traffic on LAN interface and "out" as being
>> traffic on WAN interface they could very well be negative.
>>
>> If you measure "in" as being packets into the box from any interface,
>> and "out" as being packets leaving the Squid box. It could very well be
>> *either* positive or negative.
>>
>> If you are measuring only one interface, they will again be *either*
>> positive or negative depending on the interface.
>>
>>
>> So ... what are "in" and "out" measuring *exactly* ??
>>
>>
>> Amos
>
> well , i must be missunderstanding something about the bw saving
> calculation !!!
> the question now is :
> how i calculate the bw that im saving by squid ?????

The full calculation is:

   bytes from client
 - bytes to server

 + bytes to client
 - bytes from server

 = bandwidth saving/loss.

Current Squid only surface the metrics necessary to calculate that
yourself in the "utilization" cachemgr report (the last section has
totals) or SNMP counters
(http://wiki.squid-cache.org/Features/Snmp#Squid_OIDs) under
"Per-Protocol Statistics".

Squid adds headers and sometimes chunked encoding overheads and strips
some garbage from the headers as things go through. So even on a
non-caching proxy there is a difference which may add up to a savings OR
a loss.

Amos
Received on Mon Nov 11 2013 - 08:45:35 MST