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From: Mark Papadakis <>
Subject: Feature: zero-copy splice API/opcode
Date: Thu, 9 Jan 2020 16:58:12 +0200
Message-ID: <> (raw)


I ‘ve been trying to replicate the benefits provided by sendfile() using e.g O_DIRECT access, together with IOSQE_IO_LINK in SQE flags and MSG_ZEROCOPY, but it doesn’t appear to work. Other ideas didn’t work either.

I would really appreciate a sendfile like SQE opcode, but maybe some sort of generic DMA/zero-copy based opcode based on splice semantics could be implemented, so that e.g a vmsplice() like alternative could also work.

(That would be the last remaining bit of functionality missing from io_uring, now that Jens has implemented support for IOSQE_ASYNC, IORING_REGISTER_EVENTFD_ASYNC and for managing epoll FDs, for enabling support for io_uring on ).

Thank you,

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 14:58 Mark Papadakis [this message]
2020-01-12 21:21 ` Pavel Begunkov

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