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From: Christian Dietrich <[email protected]>
To: Hao Xu <[email protected]>, Jens Axboe <[email protected]>
Cc: [email protected], Joseph Qi <[email protected]>,
	[email protected],
	"Franz-B. Tuneke" <[email protected]>,
	Hendrik Sieck <[email protected]>
Subject: Re: [POC RFC 0/3] support graph like dependent sqes
Date: Mon, 27 Dec 2021 06:49:11 +0100	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Hao Xu <[email protected]> [27. Dezember 2021]:

> Hi Christian,
> Great! Thanks for the testing, a question here: the first generator
> iouring means BPF-enhanced iouring?

No, actually not. I've only shown the plain io_uring vs. linear
systemcall here. Within the generator, I call the io_uring+bpf just
'bpf'.


> I currently don't have a specifuc use case, just feel this may be useful
> since there are simple cases like open-->parallel reads->close that
> linear dependency doesn't apply, so this POC is sent more like to get
> people's thought about user cases..

That is in principle a good idea. However, as Franz can tell you, for
many uses cases predefining the followup actions does not work. For
example, for reads, it can happen that you get a short read, whereby you
cannot directly continue to the next action.

chris
-- 
Prof. Dr.-Ing. Christian Dietrich
Operating System Group (E-EXK4)
Technische Universität Hamburg
Am Schwarzenberg-Campus 3 (E), 4.092
21073 Hamburg

eMail:  [email protected]
Tel:    +49 40 42878 2188
WWW:    https://osg.tuhh.de/

      reply	other threads:[~2021-12-27  5:49 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-14  5:57 [POC RFC 0/3] support graph like dependent sqes Hao Xu
2021-12-14  5:57 ` [PATCH 1/3] io_uring: add data structure for graph sqe feature Hao Xu
2021-12-14  5:57 ` [PATCH 2/3] io_uring: implement new sqe opcode to build graph like links Hao Xu
2021-12-14  5:57 ` [PATCH 3/3] io_uring: implement logic of IOSQE_GRAPH request Hao Xu
2021-12-14 15:21 ` [POC RFC 0/3] support graph like dependent sqes Pavel Begunkov
2021-12-14 16:53   ` Hao Xu
2021-12-14 18:16     ` Pavel Begunkov
2021-12-16 16:55       ` Hao Xu
2021-12-17 19:33         ` Pavel Begunkov
2021-12-18  6:57           ` Hao Xu
2021-12-21 16:19             ` Pavel Begunkov
2021-12-23  4:14               ` Hao Xu
2021-12-23 10:06 ` Christian Dietrich
2021-12-27  3:27   ` Hao Xu
2021-12-27  5:49     ` Christian Dietrich [this message]

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