Re: Cache-DIGEST false hits

Hi Serge,

        I am not sure why you think that most of CACHE_DIGEST_HIT are false
hits. The tables you have posted do not contain explicit information about
false hits as far as I can tell. Does Calamaris support CACHE_DIGEST tags?
Please explain what makes you think that the number of false hits is too
large.

Thanks,

Alex.

On Tue, 18 Aug 1998, Serge Krashakov wrote:

> Accidently, I have found that the most of CACHE_DIGEST_HIT are false hits.
> For example, yesterday daily statistics for HTTP requests from the first
> cache-server is:
>
> # Outgoing requests by destination
> neighbor type request % kByte % sec kB/sec
> ....
> second-cache 3126 2.66 8328 0.87 0 0.24
> CACHE_DIGEST_HIT 3053 2.60 7838 0.82 0 0.23
> SIBLING_HIT 73 0.06 490 0.05 0 0.50
>
> Meanwile, calamaris report from second-cache for HTTP-requests from the first
> cache says:
>
> # Incoming TCP-requests by status
> status request % kByte % sec kB/sec
> --------------------------------- -------- ------ --------- ------ ---- -------
> HIT 1143 36.33 2250 20.35 0 4.98
> TCP_IMS_HIT 894 28.42 249 2.25 0 11.80
> TCP_HIT 218 6.93 1918 17.35 2 4.47
> TCP_MEM_HIT 22 0.70 62 0.56 0 307.15
> TCP_NEGATIVE_HIT 5 0.16 2 0.02 0 65.76
> TCP_REFRESH_HIT 4 0.13 19 0.17 0 14.69
> MISS 1976 62.81 6355 57.48 20 0.16
> TCP_MISS 1976 62.81 6355 57.48 20 0.16
> ERROR 27 0.86 2452 22.17 1 136.36
> TCP_IMS_MISS 27 0.86 2452 22.17 1 136.36
> --------------------------------- -------- ------ --------- ------ ---- -------
> Sum 3146 11056 13 0.28
>
> # Requested content-type
> content-type request % kByte % hit-%
> --------------------------------------- -------- ------ --------- ------ ------
> ......
> application/cache-digest 30 0.95 2707 24.48 16.67
> --------------------------------------- -------- ------ --------- ------ ------
> Sum 3146 100.00 11056 100.00 36.33
>
>
> My questions are:
>
> 1. Why the are so many false hits? Is there any way to improve
> using cache digest?
>
> 2. Is it possible to control cache_digest hit and miss using Cache Manager?
> (Peer Selection menu seems doesn't work)
>
> Serge Krashakov
>
Received on Tue Aug 18 1998 - 09:51:26 MDT