Re: [squid-users] squid performance tunning

2011/8/18 Amos Jeffries <squid3_at_treenet.co.nz>:
> On 18/08/11 22:53, Kaiwang Chen wrote:
>>
>> 2011/8/18 Amos Jeffries<squid3_at_treenet.co.nz>:
>>>
>>> On 18/08/11 19:40, Drunkard Zhang wrote:
>>>>
>>>> 2011/8/18 Chen Bangzhong:
>>>>>
> <snip>
>>>>
>>>>> I don't know why there are so many disk writes and there are so many
>>>>> objects on disk.
>>>
>>> All traffic goes through either RAM cache or if its bigger than
>>> maximum_object_size_in_memory will go through disks.
>>>
>>>  From that info report ~60% of your traffic bytes are MISS responses. A
>>> large
>>> portion of that MISS traffic is likely not storable, so will be written
>>> to
>>> cache then discarded immediately. Squid is overall mostly-write with its
>>> disk behaviour.
>>
>> Will a "cache deny" matching those non-storable objects suppress
>> storing them to disk?
>> And HTTP header 'Cache-Control: no-store' ?
>
> "no-store" header and "cache deny" directive have the same effect on your
> Squid. Both erase existing stored objects and erase the newely received one
> _after_ it is finished transfer.
>
>  The difference is that the header applies everywhere receiving the object.
> The cache access control is limited to that one Squid instance testing it.

Great. What about "Cache-Control: max-age=0" and "Cache-Control:
no-cache" responses? Does squid store them, hoping it is cheaper to
make a validatation than to fetch a whole fresh object? Which souce
code files describe the logic to deal with such cases?

>
> Amos
> --
> Please be using
>  Current Stable Squid 2.7.STABLE9 or 3.1.14
>  Beta testers wanted for 3.2.0.10
>

Thanks,
Kaiwang
Received on Thu Aug 18 2011 - 14:40:56 MDT