Hi Yalei, Are you testing with master latest? Yes, blocking mode will be properly supported. The reason it won’t block now is because we need to poll multiple message queues (vpp’s and cut-through sessions) and -1 is not interpreted as a large number. This will be fixed once we switch from condvars to eventfds for notifications, at which point, we’ll manage message queue notifications with epoll.
As for your second question, with the latest changes, we only support edge-triggered events. That is, vpp notifies apps (so vcl included) that an io event (rx or tx space available) has occurred only once. VCL consumes that event and then notifies the app. The expectation is that apps will proceed to doing rx/tx until no more data/space is available and then enter epoll again. A side effect of that is that epoll will not return EPOLLOUT unless the fifo really underwent a change from full to not full. Select on the other hand does poll all fifos to check if tx space is available, but that also makes it considerably slower. Florin > On Aug 3, 2018, at 1:14 AM, wylandrea <wyland...@gmail.com> wrote: > > Hi, > > These days, I tested the vcl and get some confusion. I don't know whether I > understand it right. Anyone could help me? > > looks like vppcom_epoll_wait implement in non-blocking mode, it will loop and > check the fifo of the related sessions. > > Will vpp implement a blocking mode epoll_wait? > > Another issue is that seems it only support EPOLLLT, clear_et_mask is not > used. > > Any ideas? > > /Yalei > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#10028): https://lists.fd.io/g/vpp-dev/message/10028 > Mute This Topic: https://lists.fd.io/mt/24152381/675152 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [fcoras.li...@gmail.com] > -=-=-=-=-=-=-=-=-=-=-=-
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#10034): https://lists.fd.io/g/vpp-dev/message/10034 Mute This Topic: https://lists.fd.io/mt/24152381/21656 Group Owner: vpp-dev+ow...@lists.fd.io Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
