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From: Pavel Begunkov <[email protected]>
To: Stefan Metzmacher <[email protected]>, Jens Axboe <[email protected]>,
	[email protected]
Subject: Re: [PATCH 0/2] send[msg]()/recv[msg]() fixes/improvements
Date: Wed, 17 Mar 2021 23:39:18 +0000	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 17/03/2021 23:26, Stefan Metzmacher wrote:
> Hi Pavel,
> 
>>>> here're patches which fix linking of send[msg]()/recv[msg]() calls
>>>> and make sure io_uring_enter() never generate a SIGPIPE.
>>
>> 1/2 breaks userspace.
> 
> Can you explain that a bit please, how could some application ever
> have a useful use of IOSQE_IO_LINK with these socket calls?

Packet delivery of variable size, i.e. recv(max_size). Byte stream
that consumes whatever you've got and links something (e.g. notification
delivery, or poll). Not sure about netlink, but maybe. Or some
"create a file via send" crap, or some made-up custom protocols

>> Sounds like 2/2 might too, does it?
> 
> Do you think any application really expects to get a SIGPIPE
> when calling io_uring_enter()?

If it was about what I think I would remove lots of old garbage :)
I doubt it wasn't working well before, e.g. because of iowq, but
who knows

-- 
Pavel Begunkov

  reply	other threads:[~2021-03-17 23:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16 15:33 [PATCH 0/2] send[msg]()/recv[msg]() fixes/improvements Stefan Metzmacher
2021-03-16 15:33 ` [PATCH 1/2] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() calls Stefan Metzmacher
2021-03-20 19:33   ` [PATCH v2 1/1] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Stefan Metzmacher
2021-03-20 22:57     ` Jens Axboe
2021-03-21 10:20       ` Stefan Metzmacher
2021-03-21 13:10         ` Jens Axboe
2021-03-16 15:33 ` [PATCH 2/2] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Stefan Metzmacher
2021-03-17 22:36 ` [PATCH 0/2] send[msg]()/recv[msg]() fixes/improvements Jens Axboe
2021-03-17 23:07   ` Pavel Begunkov
2021-03-17 23:24     ` Jens Axboe
2021-03-17 23:26     ` Stefan Metzmacher
2021-03-17 23:39       ` Pavel Begunkov [this message]
2021-03-18  0:15         ` Stefan Metzmacher
2021-03-18 13:00           ` Pavel Begunkov
2021-03-18 13:08           ` Pavel Begunkov

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