linux-kernel - Re: [PATCH V6 00/30] block: support multipage bvec

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Message-ID: <CAJX1YtbmOhXh7rfb72hY=d+EumOfacqCxUY_8t0u39+0R4emcw@mail.gmail.com>
Date:   Thu, 21 Jun 2018 10:40:37 +0200
From:   Gi-Oh Kim <gi-oh.kim@...fitbricks.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, hch@...radead.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>, dsterba@...e.cz,
        ying.huang@...el.com, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, "Theodore Ts'o" <tytso@....edu>,
        darrick.wong@...cle.com, colyli@...e.de,
        Filipe Manana <fdmanana@...il.com>, rdunlap@...radead.org
Subject: Re: [PATCH V6 00/30] block: support multipage bvec

On Thu, Jun 21, 2018 at 3:17 AM, Ming Lei <ming.lei@...hat.com> wrote:
> On Fri, Jun 15, 2018 at 02:59:19PM +0200, Gi-Oh Kim wrote:
>> >
>> > - bio size can be increased and it should improve some high-bandwidth IO
>> > case in theory[4].
>> >
>>
>> Hi,
>>
>> I would like to report your patch set works well on my system based on v4.14.48.
>> I thought the multipage bvec could improve the performance of my system.
>> (FYI, my system has v4.14.48 and provides KVM-base virtualization service.)
>
> Thanks for your test!
>
>>
>> So I did back-porting your patches to v4.14.48.
>> It has done without any serious problem.
>> I only needed to cherry-pick "blk-merge: compute
>> bio->bi_seg_front_size efficiently" and
>> "block: move bio_alloc_pages() to bcache" patches before back-porting
>> to prevent conflicts.
>
> Not sure I understand your point, you have to backport all patches.

Never mind.
I just meant I did backporting for myself and it is still working well.

>
> At least now, BIO_MAX_PAGES can be fixed as 256 in case of CONFIG_THP_SWAP,
> otherwise 2 pages may be allocated for holding the bvec table, so tests
> in case of THP_SWAP may be improved.
>
> Also filesystem may support IO to/from THP, and multipage bvec should
> improve this case too.

OK, I got it.
I will find something to use THP_SWAP and run the performance test with it.
Thank you ;-)


-- 
GIOH KIM
Linux Kernel Entwickler

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