lkml.org 
[lkml]   [2018]   [Jun]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH V6 00/30] block: support multipage bvec
On Thu, Jun 21, 2018 at 3:17 AM, Ming Lei <ming.lei@redhat.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

ProfitBricks GmbH
Greifswalder Str. 207
D - 10405 Berlin

Tel: +49 176 2697 8962
Fax: +49 30 577 008 299
Email: gi-oh.kim@profitbricks.com
URL: https://www.profitbricks.de

Sitz der Gesellschaft: Berlin
Registergericht: Amtsgericht Charlottenburg, HRB 125506 B
Geschäftsführer: Achim Weiss, Matthias Steinberg, Christoph Steffens

\
 
 \ /
  Last update: 2018-06-21 10:42    [W:0.086 / U:0.576 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site