UCX Memory

[Wim Van den Wyngaert]

Raj,

Found this :
Before actual transmission, a transmit data operation moves data from the user process space to the large buffer.
Until a user process is ready to read data, a receive data operation stores received data in the large buffers.

Is it possible that user processes doing network traffic are on low priority and thus do not get the cpu to receive the packets ?
Is it possible that a cpu eater is active from time to time ?

Wim

[Rajarshi Gupta]

The default value for the quota in our system is 4096 and max value for small & large buffer is 1000 and 200. are these all denotes the value in Blocks ? If QUOTA is the limit for individual process / user or instance how can it be 4096, greater than Max large buffer which is 200?

[Volker Halle]

Rajarshi,

TCP receive and Send QUOTA is measured in bytes.

The data shown with UCX SHOW COMM [/MEM] is the no. of buffers (small, large, IRPs).

Small mbufs are 256. bytes, large mbufs vary in size (see the document provided by Wim).

Volker.