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Message-ID: <2f881b00-e434-d713-8cfc-18162a16f7f7@kernel.dk>
Date: Fri, 23 Apr 2021 08:38:25 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Changheun Lee <nanich.lee@...sung.com>, bvanassche@....org,
Johannes.Thumshirn@....com, asml.silence@...il.com,
damien.lemoal@....com, gregkh@...uxfoundation.org,
hch@...radead.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, ming.lei@...hat.com, osandov@...com,
patchwork-bot@...nel.org, tj@...nel.org, tom.leiming@...il.com
Cc: jisoo2146.oh@...sung.com, junho89.kim@...sung.com,
mj0123.lee@...sung.com, seunghwan.hyun@...sung.com,
sookwan7.kim@...sung.com, woosung2.lee@...sung.com,
yt0928.kim@...sung.com
Subject: Re: [PATCH v8] bio: limit bio max size
On 4/21/21 3:47 AM, Changheun Lee wrote:
> bio size can grow up to 4GB when muli-page bvec is enabled.
> but sometimes it would lead to inefficient behaviors.
> in case of large chunk direct I/O, - 32MB chunk read in user space -
> all pages for 32MB would be merged to a bio structure if the pages
> physical addresses are contiguous. it makes some delay to submit
> until merge complete. bio max size should be limited to a proper size.
>
> When 32MB chunk read with direct I/O option is coming from userspace,
> kernel behavior is below now in do_direct_IO() loop. it's timeline.
>
> | bio merge for 32MB. total 8,192 pages are merged.
> | total elapsed time is over 2ms.
> |------------------ ... ----------------------->|
> | 8,192 pages merged a bio.
> | at this time, first bio submit is done.
> | 1 bio is split to 32 read request and issue.
> |--------------->
> |--------------->
> |--------------->
> ......
> |--------------->
> |--------------->|
> total 19ms elapsed to complete 32MB read done from device. |
>
> If bio max size is limited with 1MB, behavior is changed below.
>
> | bio merge for 1MB. 256 pages are merged for each bio.
> | total 32 bio will be made.
> | total elapsed time is over 2ms. it's same.
> | but, first bio submit timing is fast. about 100us.
> |--->|--->|--->|---> ... -->|--->|--->|--->|--->|
> | 256 pages merged a bio.
> | at this time, first bio submit is done.
> | and 1 read request is issued for 1 bio.
> |--------------->
> |--------------->
> |--------------->
> ......
> |--------------->
> |--------------->|
> total 17ms elapsed to complete 32MB read done from device. |
>
> As a result, read request issue timing is faster if bio max size is limited.
> Current kernel behavior with multipage bvec, super large bio can be created.
> And it lead to delay first I/O request issue.
Applied, thanks.
--
Jens Axboe
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