You can find information about differentiated services and quality of service from print and online sources.
IPQoS conforms to the specifications that are described in the following RFCs:
RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers – Describes an enhancement to the type of service (ToS) field or DS fields of the IPv4 and IPv6 packet headers to support differentiated services
RFC 2475, An Architecture for Differentiated Services – Provides a detailed description of the organization and modules of the Diffserv architecture
IPQoS documentation includes the following man pages:
ipqosconf (1M) - Describes the command for setting up the IPQoS configuration file
ipqos (7ipp) – Describes the IPQoS implementation of the Diffserv architectural model
ipgpc (7ipp) – Describes the IPQoS implementation of a Diffserv classifier
tokenmt (7ipp) – Describes the IPQoS tokenmt meter
tswtclmt (7ipp) – Describes the IPQoS tswtclmt meter
dscpmk (7ipp) – Describes the DSCP marker module
dlcosmk (7ipp) – Describes the IPQoS 802.1D user-priority marker module
flowacct (7ipp) – Describes the IPQoS flow-accounting module
acctadm (1M) – Describes the command that configures the Oracle Solaris extended accounting facilities and includes IPQoS extensions.