Re: Document x Byte Hit Ratio

Duane wrote:

> > Hello there,
> >
> > How is it possible for Byte-Hit-Ratio to be <0 ?
>
> 12.31. Why do I see negative byte hit ratio?
>
> Byte hit ratio is calculated a bit differently than Request hit ratio.
> Squid counts the number of bytes read from the network on the server-
> side, and the number of bytes written to the client-side. The byte
> hit ratio is calculated as
>
> (client_bytes - server_bytes) / client_bytes
>
> If server_bytes is greater than client_bytes, you end up with a nega-
> tive value.
>
> The server_bytes may be greater than client_bytes for a number of
> reasons, including:
>
> o Cache Digests and other internally generated requests. Cache
> Digest messages are quite large. They are counted in the
> server_bytes, but since they are consumed internally, they do not
> count in client_bytes.
>
> o User-aborted requests. If your quick_abort setting allows it,
> Squid sometimes continues to fetch aborted requests from the
> server-side, without sending any data to the client-side.
  * Even if not, especially if you use delay pools and are very
  * strict on user bandwidth, when a client aborts a connection you
  * have most likely received data for that user which you never got
  * to send to them.

Davied.

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David Luyer
Senior Network Engineer
Pacific Internet (Aust) Pty Ltd
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