Hi Kevin, > -----Original Message----- > From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Kevin Yan > Sent: Friday, August 4, 2017 2:55 AM > To: dev@dpdk.org > Subject: [dpdk-dev] DPDK qos support for 40G port > > Hi, > I have a question about dpdk qos feature, in rte_sched.h,
<snip>... > rate is type of uint32_t, but if physical port rate is 40G > bit/s, which is > 5G byte/s, 5G already exceed the max value of uint32_t, so I doult that 40G is > not supported by dpdk qos lib, or any error of my understanding? > Yes, your understanding is correct, currently the port rate in bytes per second needs to be represented as 32-bit number. So, we can currently do single port with 10GbE and 25GbE rate, but not single port of 40GbE or 100GbE. Please note that we can do 40GbE as 4 ports of 10GbE each, which is a very common configuration for 40GbE. This limitation is not trivial to remove, i.e. more code is needed to remove this limitation than just changing the rate data type to uint64_t. Thanks for your feedback. Good to know that we should upgrade this library to support 40GbE rates sooner rather than later. > Thanks and waiting for your reply! > > > BRs, > Kevin > Regards, Cristian
