QoS (Quality of Service) Support

• Version: 3.1, 2.7

• Developer: Marin Stavrev

• More: http://zph.bratcheda.org/

Details

Zero Penalty Hit created a patch to set QoS markers on outgoing traffic.

• Allows you to select a TOS/Diffserv value to mark local hits.
• Allows you to select a TOS/Diffserv value to mark peer hits.
• Allows you to selectively set only sibling or parent requests

• Allows any HTTP response towards clients will have the TOS value of the response coming from the remote server masked. For this to work correctly, you will need to patch your linux kernel with the TOS preserving ZPH patch. The kernel patch can be downloaded from http://zph.bratcheda.org

• Allows you to mask certain bits in the TOS received from the remote server, before copying the value to the TOS send towards clients.

Squid Configuration

Squid 3.1

The configuration options for 2.7 and 3.1 are based on different ZPH patches. The 3.1 configuration provides clear TOS settings for each outbound response type.

• The 0xNN values here are set according to your system policy. They may differ from those shown.

  qos_flows has been created as final polish from 3.1.0.4.

Responses found as a HIT in the local cache

qos_flows local-hit=0x30

Responses found as a HIT on sibling peer.

qos_flows sibling-hit=0x31

Responses found as a HIT on parent peer.

qos_flows parent-hit=0x32

preserve-miss locates and passes the same TOS settings received by Squid from the remote server, on the client connection.

• requires Linux with kernel patching.

On non-Linux or unpatched Linux the miss TOS is always zero. The capability may be disabled if desired.

qos_flows disable-preserve-miss

Squid 2.7

The configuration options for 2.7 and 3.1 are based on different ZPH patches. The 2.7 patch does not have pass-thru capability. It does however include support for some legacy QoS protocols besides ToS.

• The 0xNN values here are set according to your system policy. They may differ from those shown.

Responses found as a HIT in the local cache

zph_mode tos
zph_local 0x30

Responses found as a HIT on peer (sibling only) caches.

zph_mode tos
zph_sibling 0x31

Responses found as a HIT on peer (parent only) caches.

zph_mode tos
zph_parent 0x32

CategoryFeature