Re: [ISSUE] The time cost of IOSQE_IO_LINK

Jens Axboe
2020-02-15T01:27:53Z

On 2/14/20 6:25 PM, Carter Li 李通洲 wrote:
> There are at least 2 benefits over POLL->READ
>
> 1. Reduce a little complexity of user code, and save lots of sqes.
> 2. Better performance. Users can’t if an operation will block without
> issuing an extra O_NONBLOCK syscall, which ends up with always using
> POLL->READ link. If it’s handled by kernel, we may only poll when
> we know it’s needed.

Exactly, it'll enable the app to do read/recv or write/send without
having to worry about anything, and it'll be as efficient as having
it linked to a poll command.

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Jens Axboe