linux-kernel - Re: [RFC 0/2] nocopy bvec for direct IO

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Message-ID: <8521bb81-ce0b-356f-ea75-bb069688715f@gmail.com>
Date:   Wed, 9 Dec 2020 11:54:01 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [RFC 0/2] nocopy bvec for direct IO

On 09/12/2020 06:50, Christoph Hellwig wrote:
> On Wed, Dec 09, 2020 at 02:19:50AM +0000, Pavel Begunkov wrote:
>> A benchmark got me 430KIOPS vs 540KIOPS, or +25% on bare metal. And perf
>> shows that bio_iov_iter_get_pages() was taking ~20%. The test is pretty
>> silly, but still imposing. I'll redo it closer to reality for next
>> iteration, anyway need to double check some cases.
> 
> That is pretty impressive.  

The difference will go down with BS=~1-2 pages, just need to to find a
moment to test properly.

> But I only got this cover letter, not the
> actual patches..

Apologies, that goes for everyone as lost CCs in the patches.


-- 
Pavel Begunkov