>But I just check the source code, ibv_poll_cq() is actually ibv_cmd_poll_cq(),
>and ibv_cmd_poll_cq() calls write() system call on the IB device.
>
>Doesn't this write() system call switch to kernel mode and possiblely casuse
>a context switch ?
See verbs.h:
static inline int ibv_poll_cq(struct ibv_cq *cq, int num_entries, struct ibv_wc
*wc)
{
return cq->context->ops.poll_cq(cq, num_entries, wc);
}
The userspace provider library sets poll_cq to an internal call.
- Sean
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