Re: A proposal.

On Thu, 27 Mar 2003, Daniel Draper wrote:
> I'm interested to know peoples opinions. In regards to HIT/MISS packet
> marking I figure it might be a good idea to make it an option in the
> squid.conf file. Perhaps under the miscellaneous section and defined
> something like:
>
> mark_client_packets <miss_mark> <hit_mark>
>
> miss_mark is the number between 0 and 16 that the packet is marked with
> in the event of a cache miss and hit_mark is that of a cache hit.

Why would you use a number between 0 and 16? Wouldn't it make
more sense to use a 6-bit DSCP value (see RFC 2474)?

> Also, the ToS marks may need to be even valued only I think because of
> the organization of the bits in the IP-Header. Can anyone clarify this?

The 8-bit "Type of service" field defined in RFC 791 was subdivided into
a 3-bit precedence field, three 1-bit fields labeled D, T and R; and two
must-be-zero bits.

RFC 1349 stole one of the must-be-zero bits, but nobody paid any
attention.

RFC 2474 redefined the whole mess as a 6-bit DSCP field plus two
must-be-zero bits.

--apb (Alan Barrett)
Received on Sun Mar 30 2003 - 08:43:21 MST